Search found 6 matches

by CheloXL
Thu Aug 23, 2012 9:11 pm
Forum: Classic - Bug Reports
Topic: PNGs: Half decoded
Replies: 4
Views: 12278

Re: PNGs: Half decoded

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...
by CheloXL
Thu Aug 23, 2012 11:36 am
Forum: Classic - Bug Reports
Topic: PNGs: Half decoded
Replies: 4
Views: 12278

Re: PNGs: Half decoded

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...
by CheloXL
Wed Aug 22, 2012 6:33 pm
Forum: Classic - Bug Reports
Topic: PNGs: Half decoded
Replies: 4
Views: 12278

PNGs: Half decoded

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 ver...
by CheloXL
Tue Jun 09, 2009 2:28 pm
Forum: Classic - Bug Reports
Topic: 8 bit png with alpha (8 bits) mask
Replies: 6
Views: 1931

Re: 8 bit png with alpha (8 bits) mask

Hi Pierre,

Thanks. Do you have plans on supporting it?

Regards,
by CheloXL
Mon Jun 08, 2009 3:07 pm
Forum: Classic - Bug Reports
Topic: 8 bit png with alpha (8 bits) mask
Replies: 6
Views: 1931

Re: 8 bit png with alpha (8 bits) mask

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 ...
by CheloXL
Mon Jun 08, 2009 1:19 pm
Forum: Classic - Bug Reports
Topic: 8 bit png with alpha (8 bits) mask
Replies: 6
Views: 1931

8 bit png with alpha (8 bits) mask

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 created ...