[magick-users] Processing PSD Images

[Anthony Thyssen]

On Mon, 18 May 2009 15:44:42 +0200
Axel Rosenski <rosenski at wave-computer.de> wrote:

| Hi there, 
| 
| this is my first Post on this list and I hope you can help me. 
| 
| I'm running Imagemagick (Version: ImageMagick 6.4.3 2008-12-03 Q16 OpenMP 
| http://www.imagemagick.org) on a linux machine and I have a set of 
| Photoshopimages in varying sizes that I would like to convert into JPG.
| 
| I have to extract a clipping path, put it in the middle on a blue canvas with 
| a size of 2000x2000 pixel and save this image, resize it in the next step and 
| add a watermark image. I like to do this with one convert/composite call.
| 
| I found two (nonsatisfying) solutions:
| 
| > convert -size 2000x2000 /path/to/foto.psd[0] -flatten -resize 2000x2000 
| xc:blue -gravity center +swap -composite -write /path/to/test.jpg -resize 
| 450x450 -write /path/to/test450.jpg -resize 200x200 /path/to/test200.jpg
| 
| This creates me a canvas of 2000x2000px and resizes my images to the given 
| size. When I try to add my watermark I get a proper test.jpg, but test450.jpg 
| gets completely white.
| 
| The other solution I found out is: 
| 
| 
| >convert "foto.psd[1]" -fill "blue" -resize "2000x2000" -size "2000x2000" 
| xc:"blue" +swap -gravity "Center" -flatten -write "/path/to/test.jpg" -
| composite -gravity "center" "/path/to/watermarkimage" -resize "450x450" -write 
| "path/to/test450.jpg" -delete 1 -resize "200x200" "/path/to/test200.jpg"
| 
| With this call I have two problems:
| - the clipping path image is not centered in the middle of the image 
| - the medium and small images are not usable. 
| They have a black background with a white bar in the foreground where the 
| watermarkimage should be. I played around with some options (-draw 'color 0,0 
| floodfill' changed position of command line options).
| 
| Can anyone help me to get those two calls together?
| 
First it would have been better if you could have formated your command
into multiple lines so one major image processign step is on each line.
That makes it a LOT easier to read!

Second a canvas is NOT needed for -flatten, as it will create a canvas
as part of its processing.

Also -flatten does NOT understand -gravity.  That is a composite setting
not a image layering setting.

For info see
   Composite Geometry/Gravity   vs   Layer Canvas/Page Offsets
     http://www.imagemagick.org/Usage/compose/#geometry

Also look at examples on flattening, with canvas adjustments (using -page)
   http://www.imagemagick.org/Usage/layers/#flatten

Another alternation is to use -extent whcih will also use a composition
But does understand -gravity.  See
   http://www.imagemagick.org/Usage/crop/#extent

Later you read in your water mark but you don't compose it onto the
image!

Downloading images..
| If you need an image for testing purposes you can get it at:
| 
| http://ar.nutzerverwaltung.de/foto.psd (careful, it has ~33 MB)
| The watermarkimage is available here: 
| http://ar.nutzerverwaltung.de/stempel_axel.png

Sorry your image was HUGE, and was not yet downloaded causing the above
error.  It als also far larger than 2000x2000.  I gather than you want
that image to fit into 2000x2000, and not be clipped by it, seeing as
it already has transparency.


Continuing study...

   convert 'foto.psd[0]' -resize 2000x2000 \
           -gravity center -background blue -extent 2000x2000+0+0 \
           stempel_axel.png   -gravity center -composite \
           \( +clone -resize 450x405 -write test450.jpg +delete \) \
           \( +clone -resize 200x200 -write test200.jpg +delete \) \
           test.jpg

First note how I organized the command.  Making each line a major
processing step, alloting it to be read much more easilly by others.
Including yourself months later!

Also note that I avoided resizing a resize.  Resize is a major image
distioning operation and avoiding multiple distorts is always a good
thing.

PS: to make it look more natural ass a wave distortion
See   http://www.imagemagick.org/Usage/warping/#wave
Note the wave length is twice the image width to make an 'arch'
See http://www.imagemagick.org/Usage/fonts/#arch

   convert 'foto.psd[0]' -resize 2000x2000 \
           -gravity center -background blue -extent 2000x2000+0+0 \
           \( stempel_axel.png -background none -wave 17x700 
           \) -gravity center -geometry -10-20 -composite \
           \( +clone -resize 450x405 -write test450.jpg +delete \) \
           \( +clone -resize 200x200 -write test200.jpg +delete \) \
           test.jpg

I'll leave you to adjust the wave and geometry offset better ;-)

PS: a  -wave distortion is not the correct solution for a cylindrical
object. But this only becomes noticable close to the edges of the cylinder.
For our purposes wave should be close enough.  See IM forum discussion 
   http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=13569

I do hope to add a true cylindrical distortion to IM sometime.  

  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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  "I have a top secret gravely important assignment here."
  "What other kind do I ever get?"     -- Stainless Steel Rat (Revenge)
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