Possible bug with bilevel TIFF in IM 6.9.2.8 Q16 Mac OSX

[fmw42]

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See viewtopic.php?f=1&t=28809&p=128236#p128233 for input images.

The following fails using 2.tif as input because it is bilevel and forces the output to be bilevel including where the color overlay image, label1.gif, is placed. I have tried adding -set colorspace sRGB, -colorspace sRGB and -type truecolor right after the input images. (The latter makes the resulting image totally black)

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convert 2.tif label1.gif -gravity northwest -geometry +3+3 \
-define compose:args=80,100 -compose dissolve -composite 2_label1a.tif

http://www.fmwconcepts.com/misc_tests/t ... abel1a.tif


But it works fine if one converts the 2.tif to PNG

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convert 2.tif 2.png
convert 2.png label1.gif -gravity northwest -geometry +3+3 \
-define compose:args=80,100 -compose dissolve -composite 2_label1b.tif

http://www.fmwconcepts.com/misc_tests/t ... abel1b.tif

Note that

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convert 2.tif -type truecolor -auto-level 2b.tif

results in a totally black image.

[magick]

Add -depth 8 -compress zip to your command line. The TIFF image has a depth of 1 and a compression of Group4Compression. That is carried forward to the output image. The depth and compress options override these settings to produce the image you expect.

• convert 2.tif label1.gif -gravity northwest -geometry +3+3 -define compose:args=80,100 -compose dissolve \
  -composite -depth 8 -compress zip 2_label1b.tif

[fmw42]

Thanks that works.

I forgot about depth and compression when trying to override the bilevel input format.

[mr_hunter]

Hi there - This solution doesn't work for multi-page TIFFs as it just layers all the pages on top of each other and seems to not add the label. Any ideas? I've tried adding +adjoin but didn't make any difference..

[mr_hunter]

I've tried with PDFs and it does the same sadly as I have a need to stamp PDFs with the label also.

If I don't hear from you before have an excellent Christmas (if you celebrate it)..

[fmw42]

Can you provide an example multi-layer tiff for us to test?

[mr_hunter]

Hi there - sorry for delay. Wasn't on laptop over Christmas.

Here is the code and the associated files below...

convert 2.tif stampOnDoc.gif -gravity northwest -geometry +3+3 -define compose:args=80,100 -compose dissolve ^
-composite +adjoin -depth 8 -compress zip tmp2.tif

2.tif https://www.dropbox.com/s/b8y7shdrutcvag5/2.tif?dl=0
stampOnDoc.gif https://www.dropbox.com/s/hssmnifq2fiea ... c.gif?dl=0
tmp2.tif https://www.dropbox.com/s/jb33ac9h705zufc/tmp2.tif?dl=0

Thanks

[fmw42]

-composite only works with two images. Your tiff has several layers which are considered by IM as separate input images. So you need to use -layers composite as follows setting the alpha channel of the overlay (gif) image to 80% or whatever you want.

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convert 2.tif -coalesce \
null: \
\( stampOnDoc.gif -alpha on -channel alpha -evaluate set 80% +channel \) \
-channel rgba -gravity northwest -geometry +3+3 \
-layers composite -depth 8 -compress zip result.tif

or

Code: Select all

convert 2.tif -coalesce \
null: \
\( stampOnDoc.gif -alpha on -channel alpha -evaluate set 80% +channel \) \
-channel rgba -gravity northwest -geometry +3+3 \
-layers composite -depth 8 -compress zip +adjoin result.tif