Cutting x pixels from an image

[adamsilver]

Why this is creating many images instead of just two?

Code: Select all

convert input-image.jpg -crop 28x +repage monet_vertical_%d.jpg

I want to get two images; 28 pixels from the base and another image with what's left.

Please help.

[fmw42]

It is doing tile cropping and the part you specified is not half of the image.

Because you are doing tile cropping and you have specified only a small part of the image. It will try to crop out every section that is 28 pixels by full height.

I do not think you can do unequal tile cropping to get only two sections.

To get only two sections, you must split in half, so you can do -crop 50%x100%+0+0 and get two halves.

But you cannot do -crop 25%x100%+0+0 unless you want 4 parts.

To do what you want, you need to do two separate one section crops.

convert image -crop 28x+0+0 +repage output1
convert image -crop WWx+0+0 +repage output2

where WW=W-28

see
http://www.imagemagick.org/Usage/crop/#crop_tile

and the whole section about cropping at
http://www.imagemagick.org/Usage/crop/#crop

[anthony]

you can also use -chop to get the second half of the image.

Code: Select all

convert image -crop 28x0+0+0 +repage output1
convert image -chop 28x0+0+0  output2

or use an alternative -chop using -crop technique
See Chop, removing rows, columns and edges
http://www.imagemagick.org/Usage/crop/#chop

Code: Select all

convert image -crop 28x+0+0 +repage output1
convert image -crop 0x0+28+0 +repage output2

[adamsilver]

Thank you guys. Anthony's first method worked for me.

Code: Select all

	convert $f -gravity South  -crop 0x28+0+0 +repage label.jpg
	convert $f -gravity South  -chop  0x28  not-labeled.jpg