I don't believe this has been asked previously, but then again, the forum ignore three letter word searches, which don't ease searching info on a given format...
My request is that IrfanView should preserve PNG ancillary information (chunks) when saving, particularly tEXt chunks, which can hold information like author, title, copyright... They are, more or less, the equivalent of IPTC info for Jpeg format. This format has options to keep Comments, Exif and IPTC info, I would like to have the same for PNG.
Currently, if I open a PNG file with IV then save it under another name, I loose the tEXt chunks, but also the gAMA one, the bKGD one (background color), the tIME and even worse, IV converts it from grayscale+alpha to simple paletted image. If I ask to save with transparent color, IV asks me the unique transparent color instead of preserving the previous alpha info...
So, my suggestion is to improve support of the PNG format, hopefully by supporting at least the above remarks.
Ideally, IV should allow to add, delete or edit tEXt chunks like it allows to edit comments and IPTC data.
Thanks.
My request is that IrfanView should preserve PNG ancillary information (chunks) when saving, particularly tEXt chunks, which can hold information like author, title, copyright... They are, more or less, the equivalent of IPTC info for Jpeg format. This format has options to keep Comments, Exif and IPTC info, I would like to have the same for PNG.
Currently, if I open a PNG file with IV then save it under another name, I loose the tEXt chunks, but also the gAMA one, the bKGD one (background color), the tIME and even worse, IV converts it from grayscale+alpha to simple paletted image. If I ask to save with transparent color, IV asks me the unique transparent color instead of preserving the previous alpha info...
So, my suggestion is to improve support of the PNG format, hopefully by supporting at least the above remarks.
Ideally, IV should allow to add, delete or edit tEXt chunks like it allows to edit comments and IPTC data.
Thanks.
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