CODEWITHSUNDEEP
imagemagick
fubar
fubar

Reputation: 348

why does ImageMagick resizes all images regardless the resize limit?

I am trying to apply a resize limit for ImageMagick but it does't seem to work as supposed in the docs. I am using ImageMagick 6.9.2-3-portable-Q16-x86 in Windows 7.

convert input.jpg -resize 1920x1080^> -quality 92 output.jpg

When the input file is larger that 1920x1080, it gets resized nicely.

When the input file is smaller, e.g. 1024x768, although I would expect it to be untouched, it does get saved with the same resolution (1024x768) and different file size, depending on the quality set.

Shouldn't parameter -resize 1920x1080^> force ImageMagick to skip that file?

If not, then how can we skip those files that are smaller than the resize limit set?

Upvotes: 0

Views: 91

Answers (1)

Mark Setchell
Mark Setchell

Reputation: 207465

It is supposed to work like that... your command says "Take input.jpg and resize it if larger than 1920x1080, then change its quality and save it."

You can run something like this before you execute your command to see if it needs resizing - it will output 1 or 0 depending on whether the image needs resizing or not:

identify -format "%[fx:(w>1920)||(h>1080)?1:0]" 1921x1080.jpg
1

identify -format "%[fx:(w>1920)||(h>1080)?1:0]" 1920x1080.jpg
0

If you want to put that 0 or 1 in a variable, you do something like:

for /f "usebackq" %i in ( `identify -format "%[fx:(w>1920)||(h>1080)?1:0]" 1921x1080.jpg` ) do set resize=%i

and double up the percent signs in a .BAT file.

Upvotes: 1

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