Resize all pictures in list to largest size in list

[MadsJohansen]

Hello

Say you have a bunch of files in a folder and you want to do some "-evaluate-sequence mean" on them. Right now it will fail if the pictures in the list are different. The inspiration comes from http://blog.patdavid.net/2013/09/mean-a ... ideos.html

What I want is to have IM resize the pictures before doing the -evaluate stuff.
Is that possible? It doesn't matter if the solution is in windows or linux format


It's all part of a larger plan to have some sort of script/program that will take an argument (from the -evaluate-sequence possibilities), resize the images to the largest size (the current problem), then do the log/mean/median/cos/etc function on the pictures (perhaps via xargs so I don't run into over use of ram problems)
Example workflow:
$ IMProgramName log 50
1) resize all pictures in list (via ls or similar)
2) Create log folder in current folder
3) ls resizedPictures*.jpg | xargs 50 pictures at a time (where 50 comes from the argument of IMProgramName)
4) convert "$0" "$@" -evaluate-sequence log log/"$0" (where "log" comes from the argument of IMProgramName)
5) exit
Does that make sense or have I been smoking some funny tennis shoes too much? (And I'm not expecting a full program/script/thing for the larger plan, btw!)

Best regards
Mads Johansen

[snibgo]

The basic IM command would be:

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convert a.png b.png c.png d.png -resize 300x200! -evaluate-sequence Mean out.png

This resizes all images to exactly 300x200 before finding the mean.

How do you find the required size? A script might loop through them all, using "identify" on each. Or ...

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convert a.png b.png c.png d.png -layers Mosaic info:

... will tell you the maximum width and maximum height.

[anthony]

Or you can just 'flatten' all the images together. The final image size will be the area that contains all the images.

Note that may be larger than the largest image size as you may have a wide image and long image!

[MadsJohansen]

Or you can just 'flatten' all the images together. The final image size will be the area that contains all the images.

Note that may be larger than the largest image size as you may have a wide image and long image!

Like 'convert *.jpg -flatten out.jpg' ? It's only the size of the first image

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convert *.jpg -layers Mosaic info:

gives same result. Only problem is that all the files are loaded into memory at the same time, which is not optimal (given there’s a few thousand pictures). I did read the thread viewtopic.php?f=1&t=19855 ( [many images] Don't load all images at once? )

The way I have found to solve this problem so far is to do

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$ ls image*.jpg | xargs -n 100 sh -c 'convert "$0" "$@" -layers Mosaic info: '

That gives me (after a rename of all the files, which is no problem with irfanview on windows, if anyone sees this from a good search or similar )

• image0001.jpg JPEG 1000x1823 1000x1823+0+0 8-bit DirectClass 1.969u 0:00.639
  image0101.jpg JPEG 1000x1818 1000x1818+0+0 8-bit DirectClass 2.719u 0:00.668
  image0201.jpg JPEG 1000x2000 1000x2000+0+0 8-bit DirectClass 2.250u 0:00.617
  image0301.jpg JPEG 1000x1862 1000x1862+0+0 8-bit DirectClass 1.594u 0:00.568
  image0401.jpg JPEG 1000x2000 1000x2000+0+0 8-bit DirectClass 2.562u 0:00.666
  image0501.jpg JPEG 1000x1507 1000x1507+0+0 8-bit DirectClass 1.829u 0:00.569
  image0601.jpg JPEG 1000x1725 1000x1725+0+0 8-bit DirectClass 2.031u 0:00.583
  image0701.jpg JPEG 1000x1920 1000x1920+0+0 8-bit DirectClass 2.234u 0:00.620
  image0801.jpg JPEG 1000x1920 1000x1920+0+0 8-bit DirectClass 1.312u 0:00.512
  image0901.jpg JPEG 1000x1564 1000x1564+0+0 8-bit DirectClass 2.031u 0:00.575
  image1001.jpg JPEG 1000x1817 1000x1817+0+0 8-bit DirectClass 1.484u 0:00.574
  image1101.jpg JPEG 1000x1589 1000x1589+0+0 8-bit DirectClass 1.781u 0:00.616
  image1201.jpg JPEG 1067x1600 1067x1600+0+0 8-bit DirectClass 0.188u 0:00.088

Then my question is: Can I filter in the output of 'Mosaic info:' ?

[Bonzo]

I believe -ping does not load the image and you could use an fx expression to get the size.

You would probably need to write some code to loop through the images with convert and save the data.