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Exporting similar images resulting in wide variation in JPG file size


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I'm working on a bunch of dog portraits. I need them to be 24x36 inches, 300 dpi. I know it's not the best format for good quality, but I'm exporting them as JPGs. I need the files to be 20 mb or less for the site I'm uploading them to. The first one I did, the Chihuahua, gave me no issues, and came out at about 12 mb. I was shocked when I exported the second one, the beagle, and it was four times the size!

I created both images exactly the same way and went through the exact same steps to get to the final image for both. I have re-done them both from the beginning (except for re-drawing, of course) countless times, trying to figure out what I did differently. Export settings were identical, document settings were identical... I'm coming up with nothing! Could it be because the Beagle has a bit less white space? I'm having to lower the quality of the Beagle to get it under 20 mb, and I'd rather not do that if there's some hidden something I did that caused the larger file size.

Chihuahua with bowtie drawing_2-3 ratio.jpg

Beagle with bowtie drawing_2-3 ratio.jpg

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On 1/10/2023 at 8:25 PM, Lauri22 said:

I'm exporting them as JPGs

JPEG will give different sizes according to each image's detail, variation, contrast, number of colours and on and on. 

Mac Pro (Late 2013) Mac OS 12.7.6 
Affinity Designer 2.5.5 | Affinity Photo 2.5.5 | Affinity Publisher 2.5.5 | Beta versions as they appear.

I have never mastered color management, period, so I cannot help with that.

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