sips
sips is awesome but I can never remember my most used cases.
Square Image
Take a non-square image and “square it” - often for avatars and such.
sips -g pixelWidth test.png
sips -g pixelHeight test.png
# Set YYY to the max of the values above
sips -p YYY YYY test.png -o square.png
Whatever to 16x10
This is my go to command when downloading new images from the Webb Telescope.
sips Hubble_Deep_Field_SMACS0723.png -Z 1600x1600 -p 1600 3840 -o test.png
This doesn’t always work as expected (eg. Sips-300 with Ventura. If so, the -Z values need to be tweaked.
-
Find ratio of image (width/height)
eg. 9474/4654 = 2.035
-
If greater than 2.4 (3840/1600) - multiply 1600 by the ratio. To use for Z (1600*2.035 = 3256)
-
If ratio is less than 2.4 - multiply 3840 by the ratio. To use for Z (3840*2.035 = 7814)
sips MyImage.png -Z 7814x7814 -p 1600 3840 -o MyImage_CONVERT.png
Crop to 16x10
sips SomeTallImage.png -Z 3840x3840 -p 1600 3840 --cropOffset 635 -800 -o test.png
The offsets (x,y) in pixels require quite a bit of tweaking based on the image being resized to the longest side being 3840.
James Webb Telescope
https://webbtelescope.org/resource-gallery/images
The fact this page does not have an RSS feed maddens me.
Common flags
-i - add icon in Finder