This is a curious problem. I've got a slideshow (PHP) which uses (12)
180x135 px images. I use a form to upload the images then convert to
both resize and lower the quality to make the images lighter. 180x135
images should not be all that heavy. The goal is 10kb, but let's say
that 10-15kb is acceptable per image. These are the commands I run as
well as the output (the original file is img056.jpg and 360x270 px in size):
history | grep convert | grep percent | awk {'print $4,$5,$6,$7,$8.$9 $10}'
convert inv056.jpg -quality 10 -resize180inv056-10percent.jpg
convert inv056.jpg -quality 20 -resize180inv056-20percent.jpg
convert inv056.jpg -quality 30 -resize180inv056-30percent.jpg
convert inv056.jpg -quality 40 -resize180inv056-40percent.jpg
convert inv056.jpg -quality 50 -resize180inv056-50percent.jpg
convert inv056.jpg -quality 60 -resize180inv056-60percent.jpg
convert inv056.jpg -quality 70 -resize180inv056-70percent.jpg
convert inv056.jpg -quality 80 -resize180inv056-80percent.jpg
convert inv056.jpg -quality 90 -resize180inv056-90percent.jpg
convert inv056.jpg -quality 100 inv056-100percent-noresize.jpg
convert inv056.jpg -quality 70 inv056-70percent-noresize.jpg
convert inv056.jpg -quality 40 inv056-40percent-noresize.jpg
Below is size and output image including the original 360x270px image,
inv056.jpg:
$ ls -l | grep inv056 | awk '{print $5, $9}'
136352 inv056.jpg ---->>>> ORIGINAL IMAGE
34415 inv056-40percent-noresize.jpg
41184 inv056-70percent-noresize.jpg
158123 inv056-100percent-noresize.jpg (no resizing)
25605 inv056-10percent.jpg (all resized to 180px wide)
26304 inv056-20percent.jpg
26862 inv056-30percent.jpg
27370 inv056-40percent.jpg
27874 inv056-50percent.jpg
28442 inv056-60percent.jpg
29247 inv056-70percent.jpg
30558 inv056-80percent.jpg
33625 inv056-90percent.jpg
41184 inv056-100percent.jpg
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And the problem - I would expect quality 70% or so to have significant
effect on the resulting image size, but it's not giving me what I want.
I can get away with 50% but the decrease is so incremental that it's not
worth it.
Any thoughts or suggestions?
-Bob
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