I wanted to make a small image resize function in my asp.net website, and everything worked fine, but i faced a problem resizing transparent .png and .gif images.
After resizing done, i find that the output resized images transparent parts become white color and not transparent anymore.
This was my code:
And searched to find a solution for this problem with no hope for a complete easy solution.
And while trying to find a way, i remembered that i did a small resize tool “windows application” 4 years ago, i decided to try it and see the output, and i found after resize the image, the output is very nice and preserve transparent :).
I traced the code, and found the only difference is that in my windows application i was using the PictureBox control not the Graphics class.
I copies the code from there and put in my asp.net “sure needed to import System.Windows.Forms library in my asp.net to use the PictureBox control”.
And the Code became:
I believe that using Windows form control in asp.net is odd, but it solved my current problem, it may need some more testing for performance issues.