Legacy ImageMagick Discussions Archive

But 02-CROP.jpg would have a file size smaller than original.jpg, now that I'm croping in 16x16 blocks, or not?

you set it after doing the trim, so it has no effect.

Thanks. That is

u@h ~/d $ convert original.jpg -strip +repage -fuzz 600 -trim -format "%wx%h+%[fx:page.x]+%[fx:page.y]\n" info:
3562x8221+240+139
u@h ~/d $ convert original.jpg -strip +repage -fuzz 600 -format "%@\n" info:
3562x8221+240+139 ...

You could find the trim dimensions using %@ in string formats (see http://www.imagemagick.org/script/escape.php) and put it into variables. Then compute the next smaller multiple of 8 and use those with -crop

Ok, I have been reading http://www.imagemagick.org/discourse-server/viewtopic.php?t ...

Also bear in mind that when the -trim operation doesn't cut off an exact multiple of 8 columns or 8 rows, the image gets re-quantized into new 8x8 blocks (or 16x16 blocks, if sub-sampling), which can cause new colors to be created (by default, sub-sampling happens when the requested quality is ...

fmw42 wrote: 2017-04-26T11:04:41-07:00 Your original image has quality 69. In your command set the quality the same just before writing the output jpg. Does that help?

In my examples, commands without -quality parameter preserve the quality 69. Also there is a example with -quality 60.
isn't it what you mean?

Hello

I'm trying trim and optimize this image this image http://www.revista.lamarea.com/wp-content/uploads/2017/03/h.jpg without resizing or changing his format but most of times I got a heavier image.

This is the image (I have renamed it as original.jpg):

u@h ~/d $ wget http://www.revista ...