File size increases when editing in Sigil - Page 2

PatNY · 09-04-2013, 07:43 AM

For epubs, I think all your images should be RGB (if they weren't already that originally). But I don't think changing from CMYK to RBG will provide significant space savings. Most of the savings will come at the compression level you save the jpegs at.

I use Photoshop extensively and I don't think you need to go above quality setting 40. You can even try 25-30 if you want to save even more space. If you're not sure, see what the output looks like viewed at actual size (100%) before committing to a quality setting.

Oh, and you should be using "Save for Web," if you're not already doing that. Using Save for Web instead of Save As will optimize your file for size.

--Pat

GrannyGrump · 09-04-2013, 08:23 AM

*IF* your pictures are in black & white, sometimes converting to 256 greyscale before you convert and compress your jpeg can save a bit of file size. But sometimes not. Needs experimentation and comparison to see if it is worth trying.

There is a graphics compression utility called RIOT that lots of folks love, but for me, it couldn't beat the output from my trusty 10-year-old Paint Shop Pro.

crich70 · 09-04-2013, 01:28 PM

Quote:

Originally Posted by Claire3001

Okay - I've had a go at unzipping the file and it turns out I was calculating the image sizes wrong, so they are too big. I need to get them all down to less than 50Kb each - any ideas about how to do this without making the quality terrible? The old images were all 150 DPI, but somehow manage to be less than 50Kb each.

Perhaps a program like this one might be of help.

PixResizer

It's freeware and is compatible with Windows 98/ME/NT/2*/XP/Vista/7/8

meme · 09-04-2013, 02:53 PM

You can always use the Tools->Reports feature to list all the files in your epub and their sizes.

09-04-2013, 07:43 AM	#16
PatNY Zennist Posts: 1,022 Karma: 47809468 Join Date: Jul 2010 Device: iPod Touch, Sony PRS-350, Nook HD+ & HD	For epubs, I think all your images should be RGB (if they weren't already that originally). But I don't think changing from CMYK to RBG will provide significant space savings. Most of the savings will come at the compression level you save the jpegs at. I use Photoshop extensively and I don't think you need to go above quality setting 40. You can even try 25-30 if you want to save even more space. If you're not sure, see what the output looks like viewed at actual size (100%) before committing to a quality setting. Oh, and you should be using "Save for Web," if you're not already doing that. Using Save for Web instead of Save As will optimize your file for size. --Pat Last edited by PatNY; 09-04-2013 at 07:47 AM.

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09-04-2013, 08:23 AM	#17
GrannyGrump Obsessively Dedicated... Posts: 3,200 Karma: 34977896 Join Date: May 2011 Location: JAPAN (US expatriate) Device: Sony PRS-T2, ADE on PC	IF your pictures are in black & white, sometimes converting to 256 greyscale before you convert and compress your jpeg can save a bit of file size. But sometimes not. Needs experimentation and comparison to see if it is worth trying. There is a graphics compression utility called RIOT that lots of folks love, but for me, it couldn't beat the output from my trusty 10-year-old Paint Shop Pro.

09-04-2013, 02:53 PM	#19
meme Sigil developer Posts: 1,275 Karma: 1101600 Join Date: Jan 2011 Location: UK Device: Kindle PW, K4 NT, K3, Kobo Touch	You can always use the Tools->Reports feature to list all the files in your epub and their sizes.

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