If an image can be uploaded, scale it down to smaller than this size, or reject if unable to. Note: Upload size limit is set in nginx / apache or proxy.
EDIT: Should also include (0 to disable).
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https://github.com/discourse/discourse/blob/master/lib/upload_creator.rb#L165
Actually the down-sizing is done by reducing the number of pixels of the image by half, not by scaling the dimensions by half (which means reducing the number of pixels by 1/4).
And it compares with max_image_pixels BEFORE scaling. The correct procedure is to compare with max_image_pixels AFTER scaling the first time. Otherwise, the image runs the risk of being made smaller than necessary.
downsized_pixels = [pixels / 2, max_image_pixels].min
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Good point. pr-welcome 
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Cool man ! Thanks.
This info isnt clear in the docs…
Hi! Halving is not working for me. If I upload any file larger than “max image size” I got this:
Sorry, the image you are trying to upload is too big (maximum size is 1024KB), please resize it and try again.
EDIT: I didn’t see the option " max image megapixels" . But doesn’t help me.
What I want if is possible , is that when a user upload any image larger than 1024KB , then resize until < 1024KB and delete the original.
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Closing this out, as we now resize giant phone images on the client in the editor (that is, on the phone itself, in the browser via JavaScript) courtesy @falco.
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