XnView Software

Yes, I know. Apple's PNG have a non-standard chunk type (CgBI - that XNView ignores, so that's ok), and some PNGs have byteswapped (RGBA -> BGRA) pixel data (and that's something I can fix in any photo editor), premultiplied alpha, etc. But the image stored in several IDAT chunks is totally valid on ...

They are valid and yes, they come from a mobile device (iPad). Usually on PNGs, the image is stored in one data chunk (IDAT). But it is possible (and valid, based on the PNG specifications) that the image be stored in several data chunks, to generate a PNG in a streaming manner. This is done in that ...

Hi,
It seems that there are some PNGs that are stored in several chunks (or that's what I believe), because XnView only displays half of them (and by half I mean half of the image). Depending on the image size (width, height), XnView can display the complete image, the top vertical half, the top ...

Hi Pierre,

Thanks. Do you have plans on supporting it?

Regards,

That's not what I wanted. That creates an 8 bit png with 1 bit alpha mask - same as a GIF file. I'm talking about an 8 bit png with 8 bit alpha mask. It's like a 32 bits png (RGBA - 24.7millon colors + 256 grayscale mask), but instead of having 24bits for color, you have an indexed palette PLUS the ...

Hi,

It seems that XnView does not correctly supports 8 bit png (256 colors) with 8 bits mask? If I open the png in XnView, I see the image rendered without the mask and it is not possible to extract the mask, nor convert the file to any other format and retain the transparency.

The file was ...