![]() ![]() Surely, loosing part of an image is better than loosing it all, when it’s an image we created and for which there are no backups anywhere. Personally, I’d like PMNG to attempt to load corrupted images, but to always warn me about the problem and let me decide whether to carry on or not, so at least I’ll be aware of the potential problems.įault tolerance is, in principle, desirable, and the image library should be able to discern between unrecoverable errors and images which can be still used (although something might get lost or corrupted along the way). ![]() You can also test with ezGIF, an online images converted and optimizer that covers a lot of compression methods as well as animated PNGS: The source code of the plugin is also available, in case someone is curious about the implementation. I’ve always used it for PS7, but now it’s available only for PS CS3, apparently. Photoshop: SuperPNG pluginĪlso, Photoshop 7/CS3 support for PNG is quite limited, and I always use a free third party plugin called SuperPNG, by fnord: Also, many image formats have extensions to their standards which are not supported by some libraries, as well as to some unofficial extensions introduced by third party apps which might end up popular even though not officially endorsed (just think of how many non-standard PDF features have gained fame via Acrobat Reader). It depends on the image library they use, i.e. In the case of this thread, seems like it would be better for PMNG to decline opening the image than to open it in a damaged and misleading state. So when it comes to corrupted image files, what determines whether an application fails to open the image or not? Why is Photoshop so picky? Windows 10 for some reason doesn’t care about the slightly garbled image data while Photoshop doesn’t even try. Windows can also parse all the said corrupted images and generate thumbnails for them which I can view with Windows Explorer. Interestingly, while Photoshop would not open them, my default windows image viewer program COULD open them. I have a set of images that got partially corrupted at one time which I can’t open in Photoshop due to errors like this:īUT if I upload them to imgur then download them, they’re “fixed” and I can then use them in Photoshop. Over the years I’ve dealt with image file issues similar to this. So the root of the issue lies with the image file eh? Wish I would’ve thought to use a diff tool. Looks like you got tajmone’s attention haha.Īwesome analysis, man! I love technical graphics forensics stuff like this. could please leave both images on GDrive, for future tests and reference? (I’m keeping on my local machine a copy of both the downloaded images, but it would be best if your Zip archives links won’t expire in the near future).ĮDIT - could you supply more info about this image history? Which app was used to create the original, any other apps it was handled through, and any formats conversions it underwent - just to try and trace where the corrupt data crept in, and whether it might be considered as valid data by other apps. Maybe PMNG could benefit from this image by using it as an edge case to test the validation and conversion algorithms. Apparently, some applications seem to handle this image correctly (I’ve opened it in Aseprite without problems) while others fails (BeyondCompare too, at some level, apparently). This whole ordeal really got my attention, it’s unsual to find a corrupt image that manages to pass the checks and produce a distorted result. an unexpected metadata field not being parsed correctly).īut I suspect that there‘s something wrong in the original image because when I compare the two images with BeyondCompare the diff panel (bottom) shows extra edges, even though the lines and text overlap 100% in the originals (upper left and right panels): Potentially any of the above extra info might be the culprit interfering with PM importing the image (i.e. bad image contains the comment “ Adam7 interleaving” (referring to interlacing algorithm used).bad image is set to 72 DPI, the good one has no DPI settings.The bad image is in True Color 24-bit (16 M colors), whereas the good one has a 16 colors palette.Īlso, other difference that I noticed by examining the two images’ properties: The first difference I noticed between the two images is that when I drag the “bad” one (904 bytes) into PM the “Quantize Colors” window show up, asking how to adapt the image, whereas the “good” image (318 bytes) simply opens without adaptation windows nor problems. ![]()
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