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System.Drawing.Image to SkiaSharp

I am trying to move my code from using System.Drawing.Image to using SkiaSharp as recommended here.
I trying to find similar operations for working with Tif files from a stream.
Currently, the following is what I have using System.Drawing.Image:
System.Drawing.Image MyImage = System.Drawing.Image.FromStream(inStream);
PdfDocument doc = new PdfDocument();
for (int PageIndex = 0; PageIndex < MyImage.GetFrameCount(FrameDimension.Page); PageIndex++)
{
MyImage.SelectActiveFrame(FrameDimension.Page, PageIndex);
XImage img = XImage.FromGdiPlusImage(MyImage);
var page = new PdfPage();
page.Width = MyImage.Width;
page.Height = MyImage.Height;
doc.Pages.Add(page);
XGraphics xgr = XGraphics.FromPdfPage(doc.Pages[PageIndex]);
xgr.DrawImage(img, 0, 0, page.Width, page.Height);
}
doc.Save(outStream);
MyImage.Dispose();
My current work with SkiaSharp is the following though it does not work correctly. Note: The following code has the following error and I am trying to figure out why in addition to how to select active frames: Unhandled exception. System.ObjectDisposedException: Cannot access a closed Stream. likely due to SKCodec codec = SkiaSharp.SKCodec.Create(inStream); but I am not sure why.
PdfDocument doc = new PdfDocument();
doc.Info.CreationDate = new DateTime();
using MemoryStream inStream = new MemoryStream(data);
using var imgStream = new SKManagedStream(inStream, false);
using var skData = SKData.Create(imgStream);
using SKCodec codec = SKCodec.Create(skData);
// TODO: codec is null!
for (int PageIndex = 0; PageIndex < codec.FrameCount; PageIndex++)
{
SKImageInfo imageInfo = new SKImageInfo(codec.Info.Width, codec.Info.Height);
// create bitmap stub
using SKBitmap skBitmap = new SKBitmap(imageInfo);
IntPtr pixelsPtr = skBitmap.GetPixels();
// decode particular frame into the bitmap
codec.GetPixels(imageInfo, pixelsPtr, new SKCodecOptions(PageIndex));
// encode bitmap back
using SKData encodedData = skBitmap.Encode(SKEncodedImageFormat.Png, 100);
using Stream frameStream = encodedData.AsStream();
XImage img = XImage.FromStream(frameStream);
var page = new PdfPage();
doc.Pages.Add(page);
XGraphics xgr = XGraphics.FromPdfPage(doc.Pages[PageIndex]);
xgr.DrawImage(img, 0, 0, page.Width, page.Height);
}
doc.Save(destination);
These are other things I have tried:
Using SKCodecOptions to set the FrameIndex but how would I use it since it used for GetPixels() not Decode().
There are no properties, I found, that control FrameIndex within a SKBitmap.
The additional conversion from Image to XImage is a bit confusing as from the source here, it appears to be a constructor that creates an XImage straight from an Image. I would need to create an XImage from a SkiaSharp.SKBitmap instead I believe thought I'm not quite sure how to do this at the moment such as use an existing method like FromStream() though I don't know the differences between the uses necesarily.

You get the exception because decoding SKBitmap with
SkiaSharp.SKBitmap MyImage = SkiaSharp.SKBitmap.Decode(inStream);
disposes the inStream.
Anyway, to get the particular frame using SkiaSharp, you need to get pixels from the codec:
using MemoryStream inStream = new MemoryStream(data);
PdfDocument doc = new PdfDocument();
doc.Info.CreationDate = new DateTime();
using SKCodec codec = SkiaSharp.SKCodec.Create(inStream);
for (int PageIndex = 0; PageIndex < codec.FrameCount; PageIndex++)
{
SKImageInfo imageInfo = new SKImageInfo(codec.Info.Width, codec.Info.Height);
// create bitmap stub
using SKBitmap skBitmap = new SKBitmap(imageInfo);
IntPtr pixelsPtr = skBitmap.GetPixels();
// decode particular frame into the bitmap
codec.GetPixels(imageInfo, pixelsPtr, new SKCodecOptions(PageIndex));
// encode bitmap back
using SKData encodedData = skBitmap.Encode(SKEncodedImageFormat.Png, 100);
using Stream frameStream = encodedData.AsStream();
XImage img = XImage.FromStream(frameStream);
var page = new PdfPage();
doc.Pages.Add(page);
XGraphics xgr = XGraphics.FromPdfPage(doc.Pages[PageIndex]);
xgr.DrawImage(img, 0, 0, page.Width, page.Height);
}
doc.Save(destination);

Creating a blank pdf and uploading an image to each page

I am new to file handling in asp.net core 6.0. I want to create a blank pdf and load images from the ImagePath list into it. Using the resources on the internet, I tried to create a blank pdf and throw it into it, but in vain.
I couldn't use pdfReader inside pdfStamper. It was the only resource on the Internet that I found suitable for myself.
Link to the question; Converting Multiple Images into Multiple Pages PDF using itextsharp
How can I do that my code is below.
public static string MainStamping(string docname, List < string > imagePath, string mediaField) {
var config = new ConfigurationBuilder().AddJsonFile("appsettings.json").Build();
var webRootPath = config["AppSettings:urunResimPath"].ToString();
string filename = webRootPath + "\\menupdf\\" + docname + ".pdf";
// yeniisim = yeniisim + filelist.FileName;
// var fileName = "menupdf\\" + yeniisim;
FileStream pdfOutputFile = new FileStream(filename, FileMode.Create);
PdfConcatenate pdfConcatenate = new PdfConcatenate(pdfOutputFile);
PdfReader result = null;
for (int i = 0; i < imagePath.Count; i++) {
result = CreatePDFDocument1(imagePath[i], mediaField);
pdfConcatenate.AddPages(result);
}
pdfConcatenate.Close();
return filename;
}
public static PdfReader CreatePDFDocument1(string imagePath, string mediaField) {
PdfReader pdfReader = null;
//C:\Users\hilal\OneDrive\Belgeler\GitHub\Restaurant\Cafe.Web\wwwroot\assets\barkod-menu
var config = new ConfigurationBuilder().AddJsonFile("appsettings.json").Build();
var webRootPath = config["AppSettings:urunResimPath"].ToString();
string image = webRootPath + "\\barkod-menu\\" + imagePath;
iTextSharp.text.Image instanceImg = iTextSharp.text.Image.GetInstance(image);
MemoryStream inputStream = new MemoryStream();
inputStream.Seek(0, SeekOrigin.Begin); //I don't know what to do here do I need to use it?
pdfReader = new PdfReader(inputStream);
MemoryStream memoryStream = new MemoryStream();
PdfStamper pdfStamper = new PdfStamper(pdfReader, memoryStream);
AcroFields testForm = pdfStamper.AcroFields;
testForm.SetField("MediaField", mediaField);
PdfContentByte overContent = pdfStamper.GetOverContent(1);
IList < AcroFields.FieldPosition > fieldPositions = testForm.GetFieldPositions("ImageField");
if (fieldPositions == null || fieldPositions.Count <= 0) throw new ApplicationException("Error locating field");
AcroFields.FieldPosition fieldPosition = fieldPositions[0];
overContent.AddImage(instanceImg);
pdfStamper.FormFlattening = true;
pdfStamper.Close();
PdfReader resultReader = new PdfReader(memoryStream.ToArray());
pdfReader.Close();
return resultReader;
}
If I want to explain visually, the blank pdf I created will be uploaded in this way. Thank you

The following shows how to create a PDF using iTextSharp (v. 5.5.13.3), and add images to the PDF (one image per page). It's been tested with .NET 6.
Pre-requisite:
Download / install NuGet package iTextSharp (v. 5.5.13.3)
Add the following using statements:
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.IO;
In the code below the PDF is saved to a byte array, instead of a file to allow for more options.
CreatePdfDocument:
public static byte[] CreatePdfDocument(List<string> imagePaths)
{
byte[] pdfBytes;
using (MemoryStream ms = new MemoryStream())
{
using (Document doc = new Document(PageSize.LETTER, 1.0f, 1.0f, 1.0f, 1.0f))
{
using (PdfWriter writer = PdfWriter.GetInstance(doc, ms))
{
//open
doc.Open();
//create a new page for each image
for (int i = 0; i < imagePaths.Count; i++)
{
//add new page
doc.NewPage();
//get image
iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(imagePaths[i]);
//ToDo: set desired image size
//img.ScaleAbsolute(100.0f, 100.0f);
//center image on page
img.SetAbsolutePosition((PageSize.LETTER.Width - img.ScaledWidth) / 2, (PageSize.LETTER.Height - img.ScaledHeight) / 2);
//add image to page
doc.Add(img);
}
//close
doc.Close();
//convert MemoryStream to byte[]
pdfBytes = ms.ToArray();
}
}
}
return pdfBytes;
}
I've decided that all I want to do is write the PDF to a file. The method below writes the PDF to a file.
CreatePdf:
public static void CreatePdf(string filename, List<string> imagePaths)
{
//create PDF
byte[] pdfBytes = CreatePdfDocument(imagePaths);
//save PDF to file
System.IO.File.WriteAllBytes (filename, pdfBytes);
}
Resources:
How to generate PDF one page one row from datatable using iTextSharp
iTextSharp - Working with images
Center image in pdf using itextsharp
Additional Resources:
iTextSharp: How to resize an image to fit a fix size?

How to reference Ghostscript DLL in C#

I'm using a C# wrapper to convert PDFs to images using Ghostscript, however i cant seem to reference the dll correctly.
I have the DLL stored in the bin folder (also don't know if that's the best place to keep it there or not)
Here's my code:
byte[] fileData = null;
using (var binaryReader = new BinaryReader(Request.Files[0].InputStream))
{
fileData = binaryReader.ReadBytes(Request.Files[0].ContentLength);
}
string path = Path.GetDirectoryName(Assembly.GetExecutingAssembly().CodeBase);
Ghostscript.NET.Rasterizer.GhostscriptRasterizer rasterizer = null;
Ghostscript.NET.GhostscriptVersionInfo vesion = new Ghostscript.NET.GhostscriptVersionInfo(new Version(0, 0, 0), path + #"\gsdll64.dll", string.Empty, Ghostscript.NET.GhostscriptLicense.GPL);
Stream inStream = new MemoryStream(fileData);
MemoryStream outStream = new MemoryStream();
List<Image> imageList = new List<Image>();
using (rasterizer = new Ghostscript.NET.Rasterizer.GhostscriptRasterizer())
{
rasterizer.Open(inStream, vesion, false);
for (int i = 1; i <= rasterizer.PageCount; i++)
{
//string pageFilePath = Path.Combine(outputPath, Path.GetFileNameWithoutExtension(file) + "-p" + i.ToString() + ".jpg");
int dpi = 200;
Image img = rasterizer.GetPage(dpi, dpi, i);
img.Save(outStream, ImageFormat.Jpeg);
Image img = new Image
{
imgByteArray = outStream.ToArray()
};
imageList.Add(image);
}
rasterizer.Close();
}
I'm getting the Ghostscript native library could not be found error.
Here's the path I get
I think it has to do with the double / and 'file://' in the DLLPath string. And should I also specify the LipPath as well?
Any help??

In your case you should make ghostscript dll path this way:
string binPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
string gsDllPath = Path.Combine(binPath, Environment.Is64BitProcess ? "gsdll64.dll" : "gsdll32.dll");

Even though this does not answer the question directly, I think it's worth mentioning, because I've ran into a problem using the OP's code with Ghostscript.NET version 1.2.1 published in 2016. Here's the fix I found:
In the source code,
Ghostscript.NET\Helpers\StreamHelper.cs:171
n = output.Read(buffer, 0, buffer.Length);
really should've been
n = input.Read(buffer, 0, buffer.Length);
If you're opening a stream instead of a path, without modifying the above mentioned code, you'll get empty result because the input stream did not get copied.
Reading into the code in more depth finds that the input stream is written into a temp file then read again into memory. You'll be better off just using rasterizer.Open by the path instead of stream, if it were a PDF file on disk to begin with.

A generic error occurred in GDI+

I loaded an image into a Picture Box using:
picturebox1.Image = Image.FromFile()
and I save it by using:
Bitmap bm = new Bitmap(pictureBox1.Image);
bm.Save(FileName, ImageFormat.Bmp);
It works perfectly fine when creating a new file, but when I try to replace the existing image, I get thrown the following runtime error:
A generic error occurred in GDI+
So what can I do to solve this problem??

That because the image file is used by your picturebox1.Image, try to save it to different file path instead:
picturebox1.Image = Image.FromFile(FileName);
Bitmap bm = new Bitmap(pictureBox1.Image);
bm.Save(#"New File Name", ImageFormat.Bmp);
Edit: You could also add a copy from the image at the first place like:
picturebox1.Image = new Bitmap(Image.FromFile(FileName));
Bitmap bm = new Bitmap(pictureBox1.Image);
bm.Save(FileName, ImageFormat.Bmp);//no error will occurs here.

The FromFile method locks the file, so use the Image.FromStream() method for reading the image:
byte[] bytes = System.IO.File.ReadAllBytes(filename);
System.IO.MemoryStream ms = new System.IO.MemoryStream(bytes);
pictureBox1.Image = Image.FromStream(ms);
Then save like you were before.

This can also happen if the path does not exist.
You could create the dir with:
System.IO.Directory.CreateDirectory(System.IO.Path.GetDirectoryName(FileName));

When either a Bitmap object or an Image object is constructed from a file, the file remains locked for the lifetime of the object. As a result, you cannot change an image and save it back to the same file where it originated. http://support.microsoft.com/?id=814675
A generic error occurred in GDI+, JPEG Image to MemoryStream:
Image.Save(..) // throws a GDI+ exception because the memory stream is closed
http://alperguc.blogspot.in/2008/11/c-generic-error-occurred-in-gdi.html
EDIT: Just writing from memory. Saving to an 'intermediary' MemoryStream should work:
For example, replace this:
Bitmap newBitmap = new Bitmap(thumbBMP);
thumbBMP.Dispose();
thumbBMP = null;
newBitmap.Save("~/image/thumbs/" + "t" + objPropBannerImage.ImageId, ImageFormat.Jpeg);
with something like:
string outputFileName = "...";
using (MemoryStream memory = new MemoryStream())
{
using (FileStream fs = new FileStream(outputFileName, FileMode.Create, FileAccess.ReadWrite))
{
thumbBMP.Save(memory, ImageFormat.Jpeg);
byte[] bytes = memory.ToArray();
fs.Write(bytes, 0, bytes.Length);
}
}

try this.
picturebox1.Image = Image.FromFile(FileName);
Bitmap bm = new Bitmat(pictureBox1.Image);
Image img = (Image)b;
img.Save(FileName, ImageFormat.Bmp);

Just like #Jalal Aldeen Saa'd said, the picture box is using the file and locked from file replacement.
//unlock file by clearing it from picture box
if (picturebox1.Image != null)
{
picturebox1.Image.Dispose();
picturebox1.Image = null;
}
//put back the picture inside the pictureBox?

try this it will work
public void SavePicture()
{
Bitmap bm = new Bitmap(this.myBitmap)
bm.Save("Output\\out.bmp" ,System.Drawing.Imaging.ImageFormat.Bmp );
}

This can also happen if you forget to add the filename:
bm.Save(#"C:\Temp\Download", System.Drawing.Imaging.ImageFormat.Png);
And can be fixed by adding the file name:
bm.Save(#"C:\Temp\Download\Image.png", System.Drawing.Imaging.ImageFormat.Png);
Note: You don't actually have to add the extension for it to work.

Try this:
private void LoadPictureBoxWithImage( string ImagePath)
{
Stream objInputImageStream = null;
BitmapData bmdImageData = null;
Bitmap bmpSrcImage = null, bmTemp = null;
byte[] arrImageBytes = null;
int bppModifier = 3;
try
{
objInputImageStream = new MemoryStream();
using (FileStream objFile = new FileStream(ImagePath, FileMode.Open, FileAccess.Read))
{
objFile.CopyTo(objInputImageStream);
}
bmpSrcImage = new Bitmap(objInputImageStream);
bppModifier = bmpSrcImage.PixelFormat == PixelFormat.Format24bppRgb ? 3 : 4;
//reda from byte[] to bitmap
bmdImageData = bmpSrcImage.LockBits(new Rectangle(0, 0, bmpSrcImage.Width, bmpSrcImage.Height), ImageLockMode.ReadOnly, bmpSrcImage.PixelFormat);
arrImageBytes = new byte[Math.Abs(bmdImageData.Stride) * bmpSrcImage.Height];
System.Runtime.InteropServices.Marshal.Copy(bmdImageData.Scan0, arrImageBytes, 0, arrImageBytes.Length);
bmpSrcImage.UnlockBits(bmdImageData);
pbSetup.Image = (Bitmap)bmpSrcImage.Clone();
pbSetup.Refresh();
}
catch (Exception ex)
{
throw new Exception("Error in Function " + System.Reflection.MethodInfo.GetCurrentMethod().Name + "; " + ex.Message);
}
finally
{
if (objInputImageStream != null)
{
objInputImageStream.Dispose();
objInputImageStream = null;
}
if (bmdImageData != null)
{
bmdImageData = null;
}
if (bmpSrcImage != null)
{
bmpSrcImage.Dispose();
bmpSrcImage = null;
}
if (bmTemp != null)
{
bmTemp.Dispose();
bmTemp = null;
}
if (arrImageBytes != null)
{
arrImageBytes = null;
}
}
}

A generic error occurred in GDI+
I also faced the same issue. I tried so many ways to fix this issue. Finally, I found a place where I have gone wrong. The problem is that I used space in the file path, which is not acceptable. Now it is working fine after removing the space in front of C after the apostrophe:
"SupplyItems":"C:\\inetpub\\HIBMS_Ver1\\BarcodeImages\\Supply\\"
instead... I used below one.
"SupplyItems":" C:\\inetpub\\HIBMS_Ver1\\BarcodeImages\\Supply\\"
Minor mistake but took a long time to find and to fix it.

Note that images created by Image.Clone() will still cause GDI+ errors as shown by the BAD code below, you must use the Image.FromStream() method for reading the image as shown in the solution on this page.
//BAD CODE: the image we will try to save AFTER the original image has been cloned and disposed
Image clonedImage;
//load image from file, clone it then dispose
using (var loadedFromDiskImage = Image.FromFile(filePath))
{
clonedImage = (Image) loadedFromDiskImage.Clone();
}
//you might think the new image can be saved given the original is disposed
//but this doesn't seem to be the way Clone() works
//expect GDI+ error in line below:
clonedImage.Save(filePath);

How to convert a XPS file to an image in high quality (rather than blurry low resolution)?

I'm trying to convert an XPS with WPF.
The idea is that these images can be loaded with silverlight 4, for this I am using the following code:
// XPS Document
XpsDocument xpsDoc = new XpsDocument(xpsFileName, System.IO.FileAccess.Read);
FixedDocumentSequence docSeq = xpsDoc.GetFixedDocumentSequence();
// The number of pages
PageCount = docSeq.References[0].GetDocument(false).Pages.Count;
DocumentPage sizePage = docSeq.DocumentPaginator.GetPage(0);
PageHeight = sizePage.Size.Height;
PageWidth = sizePage.Size.Width;
// Scale dimensions from 96 dpi to 600 dpi.
double scale = 300/ 96;
// Convert a XPS page to a PNG file
for (int pageNum = 0; pageNum < PageCount; pageNum++)
{
DocumentPage docPage = docSeq.DocumentPaginator.GetPage(pageNum);
BitmapImage bitmap = new BitmapImage();
RenderTargetBitmap renderTarget =
new RenderTargetBitmap((int)(scale * (docPage.Size.Height + 1)),
(int)(scale * (docPage.Size.Height + 1)),
scale * 96,
scale * 96, PixelFormats.Pbgra32);
renderTarget.Render(docPage.Visual);
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(renderTarget));
FileStream pageOutStream = new FileStream(name + ".Page" + pageNum + ".png", FileMode.Create, FileAccess.Write);
encoder.Save(pageOutStream);
pageOutStream.Close();
This code is taken from http://xpsreader.codeplex.com/ a project to convert an XPS document.
works great!
But the problem is that the image is low resolution and blurry.
I researched and found that RenderTargetBitmap and find on this page:
http://www.codeproject.com/Questions/213737/Render-target-bitmap-quality-issues
The issue here is you Have That does not use hardware RenderTargetBitmap rendering.
One solution is to use DirectX with WPF to do this, but have not found any clear example to show me the right way to do it.
I appreciate suggestions. Thanks in advance.
Update:I attached the XPS document, I am trying to convert the image
Please download test.xps

There is a project named xps2img on sourceforge.net which converts an xps to image. It is made in C# and also contains the source code. Check it out. It will help you to achieve what you want.
http://sourceforge.net/projects/xps2img/files/

I saw in this post and in many others that peoples have problems with conversion of DocumentPage to Image and saving it on HDD.
This method took all pages from document viewer and save them on HDD as jpg images.
public void SaveDocumentPagesToImages(IDocumentPaginatorSource document, string dirPath)
{
if (string.IsNullOrEmpty(dirPath)) return;
if (dirPath[dirPath.Length - 1] != '\\')
dirPath += "\\";
if (!Directory.Exists(dirPath)) return;
MemoryStream[] streams = null;
try
{
int pageCount = document.DocumentPaginator.PageCount;
DocumentPage[] pages = new DocumentPage[pageCount];
for (int i = 0; i < pageCount; i++)
pages[i] = document.DocumentPaginator.GetPage(i);
streams = new MemoryStream[pages.Count()];
for (int i = 0; i < pages.Count(); i++)
{
DocumentPage source = pages[i];
streams[i] = new MemoryStream();
RenderTargetBitmap renderTarget =
new RenderTargetBitmap((int)source.Size.Width,
(int)source.Size.Height,
96, // WPF (Avalon) units are 96dpi based
96,
System.Windows.Media.PixelFormats.Default);
renderTarget.Render(source.Visual);
JpegBitmapEncoder encoder = new JpegBitmapEncoder(); // Choose type here ie: JpegBitmapEncoder, etc
encoder.QualityLevel = 100;
encoder.Frames.Add(BitmapFrame.Create(renderTarget));
encoder.Save(streams[i]);
FileStream file = new FileStream(dirPath + "Page_" + (i+1) + ".jpg", FileMode.CreateNew);
file.Write(streams[i].GetBuffer(), 0, (int)streams[i].Length);
file.Close();
streams[i].Position = 0;
}
}
catch (Exception e1)
{
throw e1;
}
finally
{
if (streams != null)
{
foreach (MemoryStream stream in streams)
{
stream.Close();
stream.Dispose();
}
}
}
}

A nuget package based on xps2img is now available:
https://www.nuget.org/packages/xps2img/
Api available here:
https://github.com/peters/xps2img#usage

private IList<byte[]> GetTifPagesFromXps(string xXpsFileName, double xQuality)
{
using (var xpsDoc = new XpsDocument(xXpsFileName, FileAccess.Read))
{
var docSeq = xpsDoc.GetFixedDocumentSequence();
var tifPages = new List<byte[]>();
for (var i = 0; i < docSeq.DocumentPaginator.PageCount; i++)
{
using (var docPage = docSeq.DocumentPaginator.GetPage(i))
{
var renderTarget = new RenderTargetBitmap((int)(docPage.Size.Width * xQuality), (int)(docPage.Size.Height * xQuality), 96 * xQuality, 96 * xQuality, PixelFormats.Default);
renderTarget.Render(docPage.Visual);
var jpegEncoder = new JpegBitmapEncoder { QualityLevel = 100 };
jpegEncoder.Frames.Add(BitmapFrame.Create(renderTarget));
byte[] buffer;
using (var memoryStream = new MemoryStream())
{
jpegEncoder.Save(memoryStream);
memoryStream.Seek(0, SeekOrigin.Begin);
buffer = memoryStream.GetBuffer();
}
tifPages.Add(buffer);
}
}
xpsDoc.Close();
return tifPages.ToArray();
}
}