: Blurry distortion Can anyone tell me what is causing the discoloration around the black areas in the red field in this image and how to correct it? It's not showing up in the source file

@Moriarity648

These are JPEG compression artifacts, caused by Facebook when it processes and often rescales uploaded images, and adds more lossy compression. If you follow Facebook's help guidelines for making sure your images are displayed at the best quality, you should be able to ameliorate the problem.

Here's what they say:


We automatically resize and format your photos when you upload them to
Facebook. To help make sure your photos appear in the highest possible
quality, try these tips:

Resize your photo to one of the following supported sizes:
Regular photos: 720px, 960px or 2048px wide
Cover photos: 851px by 315px
To avoid compression when you upload your cover photo, make sure the file size is less than 100KB
Save your image as a JPEG with an sRGB color profile

You can also changes your settings so that your photos are uploaded in
HD by default.


Source: en-gb.facebook.com/help/118731871603814/?helpref=hc_fnav

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@Dunderdale640

They are JPEG compression artifacts


JPEG artifacts are areas in an image with a blocky or blotchy
appearance. JPEG artifacts are the result of an aggressive
data compression scheme that discards some image data.

This is known as "lossy" data compression. Several types of artifacts
can appear which are discernible and objectionable to the user. These
can include noise around edges, blurring, a smeared appearance, color
distortion, and/or checkerboard-like blocking in busy regions.


To avoid these unsightly artifacts you should export at a higher jpeg quality, or - especially in this case where your image consists of blocks of solid colour - as a png file.

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