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I opened a PNG image, clicked Save As, changed to 16 color Bitmap, and saved it. Then, MSPaint warned about loss of information about transparent and image qualities and, I clicked OK.

As a result, letters behind the black glass object disappeared clearly like this image (Before->After).

By changing PixelFormat or removing transparent area on C# (.Net 4.6.2), I tried to implement this feature just like MSPaint, however, it wasn't removed clearly. In some way, Nothing changed.

Is that not about PixelFormat or ColorDepth? Or, Is there a way to get rid of objects behind another on PNG?

What should I do to implement that?



EDIT 1

Thank you so much, @TaW. By following your method ApplyGamma, I could solve the issue.

Kang Ki-Hoon
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    [Color quantization](https://en.wikipedia.org/wiki/Color_quantization) – Jimi Feb 05 '21 at 04:34
  • No, this is not coming (directly) from the reduced pixelformaz. You may want to play with contrast and gamma, best using a ColorMatrix! [Examples](https://stackoverflow.com/search?q=user%3A3152130+ColorMatrix). Maybe best fit: [example](https://stackoverflow.com/questions/34116706/how-to-repair-dimmed-image-of-book-page/34121073?r=SearchResults&s=10|18.5978#34121073) – TaW Feb 05 '21 at 07:59
  • Fairly sure this is just the result of matching the colours to the more limited 16 colour palette. It most likely uses the standard Windows 16 colour palette, and there is no very dark gray on that, so the closest colour it finds is black. But yea, serious colour degradation is not the way to solve issues like this. – Nyerguds Feb 09 '21 at 12:04

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