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convert & resize & crop & composite : unexpected results
Posted: 2017-08-18T01:09:00-07:00
by 32d2d7ee
I have made a compositie of three images. This works fine!
Command used:
Code: Select all
magick convert -units PixelsPerInch -size 2362x3543 xc:white
( ADH_20170808_5539.jpg -auto-orient -resize 2362x ) -geometry +0+0 -composite
( ADH_20170808_5578.jpg -auto-orient -resize 1175x ) -geometry +0+1777 -composite
( ADH_20170808_5619.jpg -auto-orient -resize 1175x ) -geometry +1187+1777 -composite -density 300 Sample_no_crop.jpg
Due to the camera aspect ratio the size of the image becomes: 2362x1575.
However my specs say that the top image should have the size 2362x1766, so I have to resize and crop.
On a single image I used this command and it works perfect. I get the right results.
Code: Select all
magick convert ADH_20170808_5539.jpg -auto-orient -resize "2362x1766^" -gravity Center -crop 2362x1766+0+0 +repage crop_image.jpg
Then I integrated this command in the first command:
Code: Select all
magick convert -units PixelsPerInch -size 2362x3543 xc:white
( ADH_20170808_5539.jpg -auto-orient -resize "2362x1766^" -gravity Center -crop 2362x1766+0+0 +repage ) -geometry +0+0 -composite
( ADH_20170808_5578.jpg -auto-orient -resize "1175x1766^" -gravity Center -crop 1175x1766+0+0 +repage ) -geometry +0+1777 -composite
( ADH_20170808_5619.jpg -auto-orient -resize "1175x1766^" -gravity Center -crop 1175x1766+0+0 +repage ) -geometry +1187+1777 -composite -density 300 Sample_crop.jpg
This results in:
Issue: the image is not generated as expected?
Question: What am I doing wrong?
What would be the right command?
Re: convert & resize & crop & composite : unexpected results
Posted: 2017-08-18T06:31:43-07:00
by snibgo
"-composite" respects the gravity setting. See
http://www.imagemagick.org/script/comma ... s.php#crop
Your first command had no gravity setting, so it is undefined, which is similar (but not identical) to "-gravity NorthWest".
Re: convert & resize & crop & composite : unexpected results
Posted: 2017-08-18T09:45:45-07:00
by fmw42
User snibgo has a good point. I would add that some settings inside parentheses "leak" outside and so your composite commands are probably getting -gravity center. If that is the case, you can fix that by adding -gravity northwest before -geometry on each command. Or perhaps by adding -respect-parenthesis -gravity northwest right after convert.
Re: convert & resize & crop & composite : unexpected results
Posted: 2017-08-18T13:28:36-07:00
by snibgo
I would do it like this (with whatever your shell needs for line continuation and escapes). In the first command, insert "-gravity NorthWest". Does it do what you want?
Code: Select all
magick convert
-units PixelsPerInch -size 2362x3543 xc:white
-gravity NorthWest
( ADH_20170808_5539.jpg -auto-orient -resize 2362x ) -geometry +0+0 -composite
( ADH_20170808_5578.jpg -auto-orient -resize 1175x ) -geometry +0+1777 -composite
( ADH_20170808_5619.jpg -auto-orient -resize 1175x ) -geometry +1187+1777 -composite -density 300
Sample_no_crop.jpg
In the second command, you want to switch between "NorthWest" and "Center", so I would do that explicitly.
Code: Select all
magick convert
-units PixelsPerInch -size 2362x3543 xc:white
( ADH_20170808_5539.jpg -auto-orient -resize "2362x1766^" -gravity Center -crop 2362x1766+0+0 +repage )
-gravity NorthWest -geometry +0+0 -composite
( ADH_20170808_5578.jpg -auto-orient -resize "1175x1766^" -gravity Center -crop 1175x1766+0+0 +repage )
-gravity NorthWest -geometry +0+1777 -composite
( ADH_20170808_5619.jpg -auto-orient -resize "1175x1766^" -gravity Center -crop 1175x1766+0+0 +repage )
-gravity NorthWest -geometry +1187+1777 -composite -density 300
Sample_crop.jpg
Re: convert & resize & crop & composite : unexpected results
Posted: 2017-08-19T03:02:04-07:00
by 32d2d7ee
Thanks lot!
Indeed it was the missing -gravity NorthWest which caused the images to appear at the "wrong" place.