Magick.net: Does not compress PNG file
This file does not compress. Is it issue?
Gormy
All 12 comments
Your message needs a bit more details. What do you mean by:
This file does not compress.
dlemstra
on 1 Aug 2017
I try compress this image by
var imageOptimizer = new ImageOptimizer();
imageOptimizer.LosslessCompress(filePath);
use last version of library
Magick.NET-Q16-AnyCPU 7.0.6.102
Gormy
on 1 Aug 2017
It is possible that this file cannot be compressed further with the default options. You could set OptimalCompression to true to try more options. This will take a bit longer though.
dlemstra
on 1 Aug 2017
Does not help.
Gormy
on 1 Aug 2017
What is your expectation? when you compress PNG with jpeg encoder it will compress to a amount you want. But first you have to indicate what do you expect from compression ?
meysamSamanpour
on 1 Aug 2017
I compress this image use online compressor and the image compress to ~60%. I want to same effect.
Gormy
on 1 Aug 2017
I don't know what they do with the image but the ImageOptimizer could not make it smaller. Can you also share a compressed version of the image?
dlemstra
on 3 Aug 2017
@Gormy try to save file without metatadata. The ImageMagick parameter for this is -strip
iprida
on 7 Aug 2017
The metadata is already stripped in the PNG optimizer.
dlemstra
on 7 Aug 2017
Gormy
on 15 Aug 2017
in this case, you should used optipng (optimizer tool) separately. Since ImageMagick is an image library, not an optimizer.
Most online image converter is used optimizer tool to reduce png size, but that also make png file become lossy even is lossless format.
ghost
on 16 Aug 2017
The optimizer in Magick.NET is a lossless optimizer which means that it will not modify the image. It appears that the software that you used slightly modified the image. But that slight change made a big difference in the file size. The PNG optimizer can only do lossless compression at the moment. I will have to investigate what has happened to the image to figure out what was done. I might be able to add this to Magick.NET but don't expect this anytime soon. Unless you can tell me what was done with the image exactly :)
dlemstra
on 17 Aug 2017
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Most helpful comment
The optimizer in Magick.NET is a lossless optimizer which means that it will not modify the image. It appears that the software that you used slightly modified the image. But that slight change made a big difference in the file size. The PNG optimizer can only do lossless compression at the moment. I will have to investigate what has happened to the image to figure out what was done. I might be able to add this to Magick.NET but don't expect this anytime soon. Unless you can tell me what was done with the image exactly :)