Legacy ImageMagick Discussions Archive

hi everybody

using imagemagick 6.7.7-10 on an ubuntu 14.04 LTS server i'm trying to create a single image from multiple layers in one command. i can create the layers in seperate commands, but i don't want to save all the layers as seperate files.

td;dr:
how can i write all these steps in a single (convert?) command without creating all the intermediate files:

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# color background:
convert area.jpg -background '#f3cba3' -alpha Shape -background '#558eba' -alpha remove area_color.jpg

# transparent red outline:
convert line.jpg  -negate -background '#CC0000' -alpha Shape line_color.png

# combine them with an offset:
convert area_color.jpg -page +10+10 line_color.png -flatten -crop +10+10 +repage final.jpg

i tried something like this - but it's not working at all (ends up with just a red image):

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convert \
	area.jpg -background '#f3cba3' -alpha Shape -background '#558eba' -alpha remove \
	-page +10+10 \
	line.jpg  -negate -background '#CC0000' -alpha Shape \
	-composite  -crop +10+10 +repage  final.jpg

description with example images:

these are my base images:
area.jpg

line.jpg

these commands generate the layers:
area_color.jpg:

Code: Select all

convert area.jpg -background "#f3cba3" -alpha Shape -background "#558eba" -alpha remove area_color.jpg

line_color.png (with transparent background):

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convert line.jpg  -negate -background '#CC0000' -alpha Shape line_color.png

then i can combine these layers to create the final image:

Code: Select all

convert area_color.jpg -page +10+10 line_color.png -flatten -crop +10+10 +repage final.jpg

since i will be doing this in a loop with a lot of different colors, i need to find a way without writing all these intermediate layers out to files.

how far i got myself
i managed to reduce one step (without the -page and +repage) by creating the 'line_color.png' on the fly:

Code: Select all

convert area.jpg -background "#f3cba3" -alpha Shape -background "#558eba" -alpha remove area_color.jpg
convert \
	line.jpg  -negate -background '#CC0000' -alpha Shape \
	area_color.jpg -reverse -composite final_nocrop.jpg

but i can't integrate the "area_color.jpg" generation into the seccond command. nor do the page/repage correctly.

any hints from the pros?
please?

These are solid-colour images. Why are you using lossy JPEG compression?

If you write your third convert like this (bash syntax):

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convert \
  area_color.jpg -page +10+10 \
  line_color.png \
  -flatten \
  -crop +10+10 +repage \
  final.jpg

... then, for each input image, substitute the image expressions that make them. Put each input in parentheses.

Code: Select all

convert \
  \( area.jpg \
    -background '#f3cba3' -alpha Shape -background '#558eba' -alpha remove \
    -page +10+10 \) \
  \( line.jpg -negate -background '#CC0000' -alpha Shape \) \
  -flatten \
  -crop +10+10 +repage \
  final2.png

Use parenthesis processing and clones if needed to keep all the commands properly separated, but in one long command line. See

http://www.imagemagick.org/Usage/basics/#parenthesis
http://www.imagemagick.org/Usage/basics/#clone

Something like this:

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convert \( area.jpg -background '#f3cba3' -alpha Shape -background '#558eba' -alpha remove \) \
\( line.jpg  -negate -background '#CC0000' -alpha Shape \) \
-geometry +10+10 -composite -crop +10+10 +repage final.jpg

But I have never seen the usage of -crop without WxH.

What are you trying to do with the crop?

Using -chop twice seems to do the same thing:

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convert \( area.jpg -background '#f3cba3' -alpha Shape -background '#558eba' -alpha remove \) \
\( line.jpg  -negate -background '#CC0000' -alpha Shape \) \
-geometry +10+10 -composite -gravity north -chop 0x10 -gravity west -chop 10x0 +repage final1.jpg

The documentation for geometry does say:

"Occasionally, [size]offset is possible. In no cases are spaces permitted within the geometry argument."

So I guess that is allowed and just trims the top and left sides of the image.

thank you, snibgo and fmw42 for your replys. they both work as expected. also thank you for the links to the manual. i've seen the

@fmw42 about your questions:
- why jpg instead of gif?
i used jpg's only in the example because they are scaled down from the gif's from the server. the post would have been even longer (visualy) with 1920px heigh images.

- why crop (without WxH)?
i shift the lines 10px southeast so if i want it to go to all over the image i need to chop/crop 10px northwest. i can't use WxH because i don't know the size of the image. the command should work for any sized image.

I fairly often use "-crop" with just one of W and H, and sometimes without either.

If W or H is missing, it defaults to the image width or height.

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