Legacy ImageMagick Discussions Archive

I can't figure out how to properly chain commands in ImageMagick

Things that do what I expect in isolation :

Resize and then crop

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$ convert input.jpg -resize '400x400>' -gravity center -crop 300x400+0+0 +repage output.jpg

Apply overlay

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$ convert -composite input.jpg overlay.png output.jpg

Annotate

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$ convert input.jpg -annotate +55+357 'The text I want' output.jpg

I've had limited success in combining these together for instance :

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$ convert \( input.jpg -resize '400x400>' -gravity center -crop 300x400+0+0 +repage \) mask.png -composite output.jpg

Resizes the image and crops it, then applies my overlay. However regardless of what I try I can't then get the annotation to appear.

What I want to do is something like :

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$ convert \( input.jpg -resize '400x400>' -gravity center -crop 300x400+0+0 +repage \) mask.png -composite \( -annotate +55+357 'The text I want' \) output.jpg

Any help would be much appreciated. Thanks

-dwkns

If I understand what you want to do, you shouldn't need any parentheses.

You want to:
read input.jpg
resize it
crop it
read mask.png, so you now have two images in memory
composite the two images, using the default compose method "over", so you now have one image in memory
annotate

However, your annotate won't work if input.jpg is too small.

EDIT: Oops, I missed a problem. You probably want "-gravity NorthWest" before the annotate.

Boom!

'-gravity NorthWest' was exactly what I needed. I'm assuming this is needed because after the crop and resize, the reference point at which IM calculates the annotation position from changes?

But regardless thank you.

Not exactly. It's because your combined command contains "-gravity center", and this will apply for the rest of the command or until a different "-gravity" is specified.

The default gravity is "NorthWest", which is why it isn't needed in the simple command with annotate.

Legacy ImageMagick Discussions Archive

Chaining commands woes

Chaining commands woes

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Re: Chaining commands woes

Re: Chaining commands woes