Setting Palette on ASP.net/GDI+ Generated PNG Image

StackOverflow https://stackoverflow.com/questions/815519

  •  03-07-2019
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Question

I just built an application in ASP.net that returns a PNG image.

The resulting image is entirely black on a transparent background. Is there a way to index the image to reduce the file size?

I can not index the new image as it is created because I am using the graphics object which will not allow it.

Thank you very much for the help - I've been searching for ages and i can't seem to figure out how to set this up.

Was it helpful?

Solution

To the best of my knowledge, you can't do this using straight GDI+ - the built-in PNG encoder is very limited in its support for output color depths... Even if you manage to create an indexed Bitmap with a good palette in-memory, you'll still find it written out as a 32bpp PNG. To get the kind of control you need, you'll have to resort to a third-party image library.

See:

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