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Asked: 2026-06-04T12:27:55+00:00

I am using code very similar to (does the same thing as) the answer

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I am using code very similar to (does the same thing as) the answer to this question: Crop whitespace from image in PHP. I have tried this exact code as well, to the same effect:

I find that it does not work (does not trim white space) with a PNG source, even if the background of the PNG is true white (not transparent). I can send the output to imagepng without issue, but if the image source is imagecreatefrompng, nothing is trimmed.

Is there a reliable way to trim whitespace from a PNG using GD? Or perhaps a way to convert the color white to transparent and trim that instead? Or, other solution…?

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1 Answer

  1. Editorial Team

    This is a totally untested guess. However, I would assume that alpha transparency is causing the issue. The answer that you mentioned might need a bit of work.

    Perhaps try using imagecopymerge() to lay the image over a white canvas, and then go through the steps mentioned in the answer.

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