We Keep Coding

File Compression Type changes when converting image to base64

I have and image with a compression type of CCITT T.6 which is converted to base64 and sent to a backend API, where base64 string will be converted back to the original image and validate the file details. My problem is whenI convert the base64 string back to its original image, the compression type for the image has now changed to LZW. Does converting an image to a base64 string change its compression type? If so how can I keep the files original compression type.
string img = "";
using (Image image = Image.FromFile(filepath))
{
using (MemoryStream m = new MemoryStream())
{
image.Save(m, image.RawFormat);
byte[] imageBytes = m.ToArray();
// Convert byte[] to Base64 String
string base64String = Convert.ToBase64String(imageBytes);
img = base64String;
}
}
LoadImage(img);
public void LoadImage(string base64image)
{
byte[] bytes = Convert.FromBase64String(base64image);
Image image;
using (MemoryStream ms = new MemoryStream(bytes))
{
image = Image.FromStream(ms);
}
File.WriteAllBytes(filepath,bytes);
}

Getting rid of the memory stream and using Convert.ToBase64String(File.ReadAllBytes(filepath)) suggested by Steeeve seems to have solved the problem. Image Compression types are now consistent after regenerating the image from a base64 string.

UIKIt.UIImage does not contain a defintion for Save and no extension method save of type UIKit.UIImage not found.Are you mIssing assembly reference?

I am trying to convert an image to Base64 string in monotouch iOS app. I used below coding to do it. but error occurred.
using (Image image = Image.FromFile(Path))
{
using (MemoryStream m = new MemoryStream())
{
image.Save(m, image.RawFormat);
byte[] imageBytes = m.ToArray();
// Convert byte[] to Base64 String
string base64String = Convert.ToBase64String(imageBytes);
return base64String;
}
now probelm is, Save does not have any definition. And RawFormat does not have definiton and no extension method. what can i do now?

if the image already exists on disk, it is simpler to do
byte[] data = File.ReadAllBytes(path);
// Convert byte[] to Base64 String
string base64String = Convert.ToBase64String(imageBytes);
return base64String;

C# - Converting multi page tiff file to base64 string and converting back results with single image

I'm opening a tiff file from local disk:
Image multiPageImage = Image.FromFile(fileName);
Then sending it to conversion method:
base64string = ImageToBase64(multiPageImage, ImageFormat.Tiff);
public static string ImageToBase64(Image image, System.Drawing.Imaging.ImageFormat format)
{
using (MemoryStream ms = new MemoryStream())
{
// Convert Image to byte[]
image.Save(ms, format);
byte[] imageBytes = ms.ToArray();
// Convert byte[] to Base64 String
string base64String = Convert.ToBase64String(imageBytes);
return base64String;
}
}
Finally I convert my base64 to tiff file with the below code:
public static void ConvertBase64ToTiff(string base64string)
{
Byte[] bitmapData = new Byte[base64string.Length];
bitmapData = Convert.FromBase64String(FixBase64ForImage(base64string));
using (MemoryStream streamBitmap = new System.IO.MemoryStream(bitmapData))
{
Bitmap bitImage = new Bitmap((Bitmap)Image.FromStream(streamBitmap));
bitImage.Save(#"C:\myTiff.tiff");
}
}
public static string FixBase64ForImage(string base64string)
{
System.Text.StringBuilder sbText = new System.Text.StringBuilder(base64string, base64string.Length);
sbText.Replace("\r\n", String.Empty);
sbText.Replace(" ", String.Empty);
return sbText.ToString();
}
That fixing method is not mine. Actually I don't know if it is the right way or not. But I searched everwhere and trying what I find.
My tests showed that base64 string has just a single image.
Any help would be greatly appreciated!

For people who have a problem about converting multi page tiff file to base64 and vice versa you can refer to that link:
Is it possible to create a base64 string which has all frames of a multi page tiff file?
Maybe it is not totally the same question but the answer will solve this one too.

C# Base64 String to JPEG Image

I am trying to convert a Base64String to an image which needs to be saved locally.
At the moment, my code is able to save the image but when I open the saved image, it says "Invalid Image".
Code:
try
{
using (var imageFile = new StreamWriter(filePath))
{
imageFile.Write(resizeImage.Content);
imageFile.Close();
}
}
The Content is a string object which contains the Base64 String.

First, convert the base 64 string to an Image, then use the Image.Save method.
To convert from base 64 string to Image:
public Image Base64ToImage(string base64String)
{
// Convert base 64 string to byte[]
byte[] imageBytes = Convert.FromBase64String(base64String);
// Convert byte[] to Image
using (var ms = new MemoryStream(imageBytes, 0, imageBytes.Length))
{
Image image = Image.FromStream(ms, true);
return image;
}
}
To convert from Image to base 64 string:
public string ImageToBase64(Image image,System.Drawing.Imaging.ImageFormat format)
{
using (MemoryStream ms = new MemoryStream())
{
// Convert Image to byte[]
image.Save(ms, format);
byte[] imageBytes = ms.ToArray();
// Convert byte[] to base 64 string
string base64String = Convert.ToBase64String(imageBytes);
return base64String;
}
}
Finally, you can easily to call Image.Save(filePath); to save the image.

So with the code you have provided.
var bytes = Convert.FromBase64String(resizeImage.Content);
using (var imageFile = new FileStream(filePath, FileMode.Create))
{
imageFile.Write(bytes ,0, bytes.Length);
imageFile.Flush();
}

public Image Base64ToImage(string base64String)
{
// Convert Base64 String to byte[]
byte[] imageBytes = Convert.FromBase64String(base64String);
MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length);
// Convert byte[] to Image
ms.Write(imageBytes, 0, imageBytes.Length);
Image image = Image.FromStream(ms, true);
return image;
}

Front :
<Image Name="camImage"/>
Back:
public async void Base64ToImage(string base64String)
{
// read stream
var bytes = Convert.FromBase64String(base64String);
var image = bytes.AsBuffer().AsStream().AsRandomAccessStream();
// decode image
var decoder = await BitmapDecoder.CreateAsync(image);
image.Seek(0);
// create bitmap
var output = new WriteableBitmap((int)decoder.PixelHeight, (int)decoder.PixelWidth);
await output.SetSourceAsync(image);
camImage.Source = output;
}

How can I store and retrieve an image using an SQLite database and a WPF application?

I have to store an image from my WPF application to the SQLite database, and then retrieve the same image and display it in the application. I tried doing this by coverting the image into byte array and storing that byte array to the SQLite database as BLOB, but this is not working. Can someone help me?

I would suggest to convert the image to a base64 string first and then store it in the database.
In C#:
Image to Base64 String
public string ImageToBase64(Image image,
System.Drawing.Imaging.ImageFormat format)
{
using (MemoryStream ms = new MemoryStream())
{
// Convert Image to byte[]
image.Save(ms, format);
byte[] imageBytes = ms.ToArray();
// Convert byte[] to Base64 String
string base64String = Convert.ToBase64String(imageBytes);
return base64String;
}
}
Base64 String to Image
public Image Base64ToImage(string base64String)
{
// Convert Base64 String to byte[]
byte[] imageBytes = Convert.FromBase64String(base64String);
MemoryStream ms = new MemoryStream(imageBytes, 0,
imageBytes.Length);
// Convert byte[] to Image
ms.Write(imageBytes, 0, imageBytes.Length);
Image image = Image.FromStream(ms, true);
return image;
}
You can save the string in the database. This question is related to it: How do i read a base64 image in WPF?

Why don't you store the path to the image relative to the application's root?