I'm looking for a way to have images on invisible form that allow alpha transparency and allow to place and use buttons/labels etc.
I've tried this Transparent background on winforms?, layered window and many more, nothing fully successful. I've ended up with such failures http://imgur.com/a/t6nmF
Transparency key only makes one color transparent, which doesn't work on images that have smooth color gradients on the edges.
First of all, are you certain that your image has a transparent background?
Layered window is exactly what you should use to achieve the desired effect. Since you don't give much details, I don't know what's wrong with your implementation. Try to use the PerPixelAlphaForm from the following article: Per Pixel Alpha Blend in C#. When used correctly, it will work (even though the article is really old).
Related
I have an application using png type and GIF with transparency in the background. So I want to display them in Winforms using PictureBox, but they still have the outline or something outside the images that seem unclear as photoshop does. I have attached the example below.
As you guys can see the image has something outside that looks so annoying, can you guys help me figure out how to fix or improve It? I appreciate that.
Below is the original png that I used in my project
enter image description here
The problem is that the image is not fully transparent where you think it is.
The problem when taking an image and removing the background with transparency is that you often use the magic wand and it works for 99% but the rest you have to fix manually.
What I personally prefer in these cases is that you take your image (the png version with transparency) then in Photoshop you add another layer and put the first layer with the image on top. Then you change background color on the second layer (the one you just created) with a strange color in regards to the image, so in this case i would test with yellow.
Then if you have everything correct you should not see your image and since part of it is transparent you will see the yellow color where the image is transparent. Now you can zoom in and check the "strange parts" of the image and then you will find the spots that are not transparent. Now you can use the eraser or magic wand and polish the edges so that you only see yellow where it should be transparent. When you are done you could test and change the yellow color on the second layer to red and just double check. Then it will probably work as a charm. Good luck! If it does not work after that, please give us more details and also add the png image.
I'm trying to draw something like the transparent-indicating background when you use Photoshop or other image processing software.
Like I said in the title, I'm using HatchBrush, and the large checker board style is not large enough for me. Beyond that, I would rather like to be able to control how large each tile is based on current zoom factor or other stuff in my environment.
I have also written the code to draw a lot of filled rectangles, but this was way too slow for some reason (this allows me to control tile size though).
I have not tried Texture Brush yet, but to have a texture means I can not change the colors on the fly easily, so I would rather avoid that unless run out of options.
Is there any ways that I can configure HatchBrush or do something more basic but efficient?
I found the answer when looking at WPF. A solution was on their tutorial with brushes.
https://msdn.microsoft.com/en-us/library/aa970904%28v=vs.110%29.aspx
I'd like to implement a similar screen clipping functionality to that of OneNote. Basically it can draw a translucent overlay on top of the whole screen, and also freeze the screen so users can clip a portion of it.
I've done some research around and it seems that the easiest way is to create a translucent TopMost form with the size of the whole screen and then perform clipping on this form. This approach, however, is slow. I see some other suggestions about doing a Direct3D hook for drawing overlay, but this is probably too complicated and I'm not sure how stable it is with respect to different Direct3D version. Any ideas how OneNote does it?
I think instead of creating the transparent layer on top of the screen, just grab a screenshot of the whole screen and make it full screen. So users are drawing on a static image not a translucent layer. Since it is a screenshot already, it is already frozen. I think this is how they do it anyway, I doubt an application can simply freeze a screen, they take a photo of it and cover your screen with it, so its as if its frozen.
I am using C# to make my desktop applications.
But I want to make more graphical applications that have full transparency backgrounds and different levels of transparency for picture box controls.
Basically, not cookie cutter opacity of removing a solid color.
How can I accomplish this with C#?
It is simple, just go ahead with WPF. This gived me a good start point.
This should help:
http://www.c-sharpcorner.com/UploadFile/scottlysle/XparentFormsCS10282007212944PM/XparentFormsCS.aspx
also
form2.Opacity = .x; where x is percentage of transparency
or
transparency can be directly edited in appearance property of form in case you are using VSTO
Is "color cycling" possible in GDI+ with WinForms? I'd like the modify one or more colors in the palette of an on screen surface so that whenever the surface is repainted, GDI+ will use the modified colors.
Rather than perform the transformation manually pixel-by-pixel, I hope to use GDI+'s capability to render surfaces using indexed colors. (8bpp indexed color?)
Is there a (fast) way to do this?
NOTE: I don't want to modify the colors globally throughout the application UI. Rather, I only need to cycle colors on one particular control surface.
AFAIK, this is tied to 8bpp video mode (256 simultaneous colors from a palette of several million). Since almost nobody runs in that mode these days, you wouldn't be able to do hardware palette-based color cycling.
Depending upon what you're trying to do, there may be simple way to achieve this. Can you provide more detail?