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After saving an .ai to .jpg I've got striped lines on gradient background.
Anti aliases is enabled.
How can I get smooth transition in this case?
You should save it as a .png if you want to retain quality.
JPEG does a horrible job compressing images, which is what you're seeing
I just made a little rectangle with a gradient and exported one as .jpg one as .png (without any optimization settings)
Compare my JPEG:
With my PNG:
Required, but never shown