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imagemagick
Martin Smith
Martin Smith

Reputation: 4077

LZW compression creating huge files in ImageMagick

I'm using a recent version of ImageMagick on Windows 10 to resize and compress .tif files with mogrify *.tif -resize 20% -compress lzw. The input files are all the same dimensions and weigh a few hundred to a thousand KB, but the output files are all the same size, around 138 MB. This suggests to me that the mogrified files are being stored uncompressed. Using mogrify *.tif -compress zip leaves the files at their inflated size.

Why is the compression step failing?

Output of magick -version:

Version: ImageMagick 7.1.0-35 Q16-HDRI x64 ff6dbbb:20220516 https://imagemagick.org
Copyright: (C) 1999 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules OpenCL OpenMP(2.0)
Delegates (built-in): bzlib cairo flif freetype gslib heic jng jp2 jpeg jxl lcms lqr lzma openexr pangocairo png ps raqm raw rsvg tiff webp xml zip zlib
Compiler: Visual Studio 2022 (193231328)

Upvotes: 1

Views: 819

Answers (1)

Martin Smith
Martin Smith

Reputation: 4077

The sequence of commands is important: success was obtained with mogrify -resize 20% -compress lzw *.tif.

Upvotes: 1

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