JPEGs (also called JPGs) are images that have been compressed to create smaller files - perfect for sharing or posting online. As a result, when you attempt to enlarge or re-use a JPEG, the image may appear grainy or pixelated. You can enhance the quality of your JPEG files by fine-tuning the image’s appearance, color, and contrast with a photo editor. If you're relatively comfortable with image manipulation, Topaz DeJPEG may be a great add-on to your current software; if you're just starting out you may want to try free software like Pixlr. If you're already familiar with Photoshop, access the powerful tools there to improve your image file!
Dear Dr.
for my opinion, I think that image enhancement process is purely dependent on the applications where we need to use the enhanced image and the types of degradation in the image. some suggested solutions from my experiments:
1) in case the image contain so much noises, it is a good idea to apply filtering operations such as mean-median etc.
2) if the image is looking too dark or too bright, I advance to apply histogram equalization process to improve the contrast.
3) finally, if the image is blurred, I suggested to apply sharpening operations in the image.
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