nquant

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The image you are attempting to quantize does not contain a 32 bit ARGB palette.

1

https://github.com/drewnoakes/nquant/blob/be8bc2e78ea412853629e8dbf98e38bed2853f72/nQuant.Core/ImageBuffer.cs#L21-L23 There is actually a workaround for this case. In my case converting the image to Format32bppPArgb and then using Quantize on it - decreased original image size by ~3...

shatulsky

Any idea about why this is happening? https://stackoverflow.com/questions/49497848/nquant-degradating-image-quality

alejandroLoz

Transparency is lost with indexed images.

2

Hola, It looks like I may have found a bug in the updated implementation. The attached image will lose the transparent background when processed using your updated library. When tested...

JimBobSquarePants