Legacy ImageMagick Discussions Archive

Glenn and Fred, thanks for the quick and detailed replies. I made some changes to my pipeline and forced everything to be PNG32 for now and that is kind of working for me at the moment. It's not ideal but it's ok. Looking forward to PNG00 fix. After I ship the project I'm working, I could also offer ...

Yes, but that's my point, I know it's not the resizing, even if you do nothing the file-format still changes, which is my point. I don't think it's the right behavior. If you do something like: convert test.png test2.png, you should get the exact same file byte to byte. If you want to optimize it ...

I understand the benefit of the size reduction, which is cool. But I don't understand why it would be forced. Ideally the tool should specify something like -optimize to allow it to do the format change for the best fitting format. There could be many reasons why you want to keep the original format ...

Thanks for clarifying this out Glenn and Fred, yeah I was confused by seeing the info in identify as palette, while when I read the file in my code it shows trueColot, now at least I know why.
Is there a work around? I tried using -type trueColor, but it didn't help.

fmw42, I'm kind of confused, as far as I can tell here, the original image is not a palette image, it's truecolor with alpha/ The header shows this (in hex): Width: 0400 Height: 0400 Bit depth: 8 Color type: 6 Compression method: 0 Filter method: 0 Interlace method: 0 6 is truecolor isn't it? so why ...

Thanks for the explanation. Yes I have a non-used alpha channel in some images (for a reason), but regardless of that, I just want the resize/sample function to scale down my image and keep everything else untouched, which should be a reasonable expectation. Glennrp, is there a quick work around ...

Thanks for the quick reply. Here is more details: - Mac OSX 10.9.1 - ImageMagick-6.8.8 - I tried all your suggestions nothing helped. Here is a sample file link to Dropbox, as you could see the file has only 5 colors, but I still want to preserve the original format. https://www.dropbox.com/s ...

Hi, I'm trying to 50%-resize a number of PNG files in a folder with the same script. The files have different formats, 24bit no-alpha, 32bit with alpha, 8bit alpha only, ....etc. I want to use a Point filter (Nearest) so I use -sample instead of resize. I want to keep the format of the original ...