# Cropping an image buffer on transparency?
**URL:** https://discourse.processing.org/t/cropping-an-image-buffer-on-transparency/35125
**Category:** Coding Questions
**Created:** [February 12, 2022, 3:01pm UTC](https://discourse.processing.org/t/cropping-an-image-buffer-on-transparency/35125 "2022-02-12T15:01:56Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@xeronimo](https://discourse.processing.org/u/xeronimo)
#### Post date: [February 12, 2022, 3:01pm UTC](https://discourse.processing.org/t/cropping-an-image-buffer-on-transparency/35125/1 "2022-02-12T15:01:56Z")
I’d like to crop/copy an image buffer in #p5js so that only the non-transparent part is kept/copied … any ideas how to do that (quickly)!? Thanks!
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### Author:  [@Tinkerer](https://discourse.processing.org/u/Tinkerer)
#### Post date: [February 16, 2022, 7:10am UTC](https://discourse.processing.org/t/cropping-an-image-buffer-on-transparency/35125/2 "2022-02-16T07:10:20Z")
Hiya
You could loop through the pixels of the buffer
do it four times starting at each corner and working along an edge
then work inwards until you get the first pixel with color
this would then give you the places to start and end your crop
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### Author:  [@xeronimo](https://discourse.processing.org/u/xeronimo)
#### Post date: [February 16, 2022, 12:38pm UTC](https://discourse.processing.org/t/cropping-an-image-buffer-on-transparency/35125/3 "2022-02-16T12:38:16Z")
Hi, I found a solution using Javascript and I have ported it to p5js: [trimCanvas - Pastebin.com](https://pastebin.com/x7KxSMRy)