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I am using "convert" from IM to get PNGs from multi-page TIFF files, everything is good except the speed. From "convert" documentation, I found:

For the MNG and PNG image formats, the quality value sets the zlib compression level (quality / 10) and filter-type (quality % 10). For compression level 0, the Huffman-only strategy is used, which is fastest but not necessarily the worst compression. The default PNG compression is 75.**

I tried "-quality 0", but there were almost no changes to the speed.

Can anyone share their ideas on how to improve the spreed? Here is my command:

convert 100Pages.tif[0,1,2,3,4,5] -quality 0 100Pages.png
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Your probably not going to gain much speed unless you work from a faster computer. – Jeff F. Jan 14 '11 at 22:26

You could try GraphicsMagick which is a derivative of ImageMagick and claims to have many improvements, including performance. I have not tried it myself.

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