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snarkophilus · 08-03-2023, 11:04 AM

Ah, of course! I forgot that PNG was lossless.

I grabbed a couple of these large PNGs and using ImageMagick's convert program and could shrink these to a much smaller files that are still more than usable for a news recipe. These are converted with convert -resize 100000@ :

Code:

img15.png PNG 1975x465 1975x465+0+0 8-bit sRGB 631111B 0.000u 0:00.000
img15_small.png PNG 651x153 651x153+0+0 8-bit sRGB 70669B 0.000u 0:00.000
img1_u1.png PNG 3840x2160 3840x2160+0+0 8-bit sRGB 6.93234MiB 0.000u 0:00.000
img1_u1_small.png PNG 421x237 421x237+0+0 8-bit sRGB 168503B 0.000u 0:00.000

-rw-rw-rw-  1 simonb   631111 Aug  1 06:01 img15.png
-rw-r--r--  1 simonb    70669 Aug  4 00:38 img15_small.png
-rw-rw-rw-  1 simonb  7269085 Aug  1 06:01 img1_u1.png
-rw-r--r--  1 simonb   168503 Aug  4 00:38 img1_u1_small.png

I see that calibre used to have a dependancy on ImageMagick but no longer does. Do we have any other options for doing something like what the convert program does?

08-03-2023, 11:04 AM	#3
snarkophilus Wannabe Connoisseur Posts: 426 Karma: 2516674 Join Date: Apr 2011 Location: Geelong, Australia Device: Kobo Libra 2, Kobo Aura 2, Sony PRS-T1, Sony PRS-350, Palm TX	Ah, of course! I forgot that PNG was lossless. I grabbed a couple of these large PNGs and using ImageMagick's convert program and could shrink these to a much smaller files that are still more than usable for a news recipe. These are converted with convert -resize 100000@ : Code: img15.png PNG 1975x465 1975x465+0+0 8-bit sRGB 631111B 0.000u 0:00.000 img15_small.png PNG 651x153 651x153+0+0 8-bit sRGB 70669B 0.000u 0:00.000 img1_u1.png PNG 3840x2160 3840x2160+0+0 8-bit sRGB 6.93234MiB 0.000u 0:00.000 img1_u1_small.png PNG 421x237 421x237+0+0 8-bit sRGB 168503B 0.000u 0:00.000 -rw-rw-rw- 1 simonb 631111 Aug 1 06:01 img15.png -rw-r--r-- 1 simonb 70669 Aug 4 00:38 img15_small.png -rw-rw-rw- 1 simonb 7269085 Aug 1 06:01 img1_u1.png -rw-r--r-- 1 simonb 168503 Aug 4 00:38 img1_u1_small.png I see that calibre used to have a dependancy on ImageMagick but no longer does. Do we have any other options for doing something like what the convert program does?