Imagemagick loosing color. Why?

General
1

I am using Imagemagick in SFOS CLI to create kind of a post-it image.
When I superimpose the yellow image on its shadow, it becomes white.
Doing this on my linux PC is working.

Do I missuse IM due to a different version?

  1. Create a transparent canvas:

convert -size 100x100 xc:none canvas.png

  1. Create a shadow:

convert -size 60x60 xc:black shadow.png

  1. Superimpose the shadow and the canvas:

convert canvas.png shadow.png -gravity center -composite canvas2.png

  1. Blur it to make it look like a shadow:

convert canvas2.png -blur 0x6 blurred_canvas2.png

  1. Create the yellow “paper”:

convert -size 72x72 xc:yellow paper.png

  1. Superimpose the post-it on the shadow:

convert blurred_canvas2.png paper.png -gravity northeast -geometry +10+10 -composite shadowed_paper.png

Result on PC:

shadowed_paper
shadowed_paper100Ă—100 1.08 KB

Result on SFOS:

shadowed_paper
shadowed_paper100Ă—100 929 Bytes

It’s working perfect until end of step 5 but then, the “paper” loses its color into step 6.

2

I can confirm the white result on my sfos device.

However, my Linux PC also produces white.

Do you have a third machine to test on so we can have a quorum?

3

Also white? This is interesting.
On my N900 it keeps the yellow.

Did you compile IM for SFOS on the same computer?

4

I use the IM from chum (or openrepos-nephros but that’s older), and the current Gentoo package on the PC.

1 Like
5

Gentoo:

Version: ImageMagick 7.1.0-13 Q16-HDRI i686 2021-10-29 https://imagemagick.org
Copyright: (C) 1999-2021 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules
Delegates (built-in): bzlib cairo djvu fftw fontconfig freetype jng jp2 jpeg lcms ltdl lzma png rsvg
tiff wmf x xml zlib
Compiler: gcc (10.3)

Sailfish:

nemo@PGXperia10:~ $ convert --version
Version: ImageMagick 7.1.0-27 Q16-HDRI armv7l 2022-02-26 https://imagemagick.org
Copyright: (C) 1999 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules OpenMP(4.5)
Delegates (built-in): bzlib fontconfig freetype jng jpeg ltdl lzma pangocairo png tiff webp xml zlib
Compiler: gcc (8.3)
1 Like
6

Use this (add colorspace):
convert blurred_canvas2.png paper.png -colorspace RGB -gravity northeast -geometry +10+10 -composite shadowed_paper.png

2 Likes
7

Magnificent! Thank you very much!

1 Like
8

On my PC:
Version: ImageMagick 6.9.10-23 Q16 x86_64 20190101 https://imagemagick.org
Copyright: © 1999-2019 ImageMagick Studio LLC
License: ImageMagick – License
Features: Cipher DPC Modules OpenMP
Delegates (built-in): bzlib djvu fftw fontconfig freetype heic jbig jng jp2 jpeg lcms lqr ltdl lzma openexr pangocairo png tiff webp wmf x xml zlib

On SFOS:
Same as yours

9

Just a typo: shadowed_paper.png, not shad owed_paper.png

10

Ooops… copy-pasting from terminal did that.

1 Like