Unpredicted behaviour when using extent (SOLVED)

[ddayan]

I'm using the rmagick extend function

cropped_image.background_color= "#ffffff"
cropped_image = cropped_image.extent(256, 256)

But in some cases it doesn't extend the image with white background


This is what I'm expecting:



what could be the problem?

[anthony]

That is weird. there is no code in Extent to actually resize images as shown!
It is really a 'create canvas', and compose image (with gravity) onto canvas operator.

When it was first developed it was actually as a ultra fast image size resize without data modification (may produce garbage) but peoples demand for it it as a way f padding images to a input size, caused it to be re-programed into a canvas compose operator instead. I can even remember the forum discussion about it, but that discussion was lost in a disk crash a long time ago.

[ddayan]

Thanks! It made be to realise that the problem is in my code. I found a case that the image stretches to the tile size before the extent function is being used.

That is weird. there is no code in Extent to actually resize images as shown!
It is really a 'create canvas', and compose image (with gravity) onto canvas operator.

When it was first developed it was actually as a ultra fast image size resize without data modification (may produce garbage) but peoples demand for it it as a way f padding images to a input size, caused it to be re-programed into a canvas compose operator instead. I can even remember the forum discussion about it, but that discussion was lost in a disk crash a long time ago.