Save as jpeg will affect quality?

Question

Does anyone know after you edited a jpeg file even do save as "12" (the highest quality) will still decrease the quality of the file?

Answer 1

If the file started out as a jpeg then saving it as a high-quality jpeg shouldn't affect quality any further. If it started out as a TIFF or other lossless format, then yes, even the highest jpeg quality will cause some slight degradation. If you look at the jpeg at like 800% you will notice a slight roughness on high-contrast edges and a little bit of "basket-weave" in areas of uniform color. This will not be noticeable in normal use, but further image processing can sometimes exaggerate these artifacts.

Answer 2

The quality of any Jpeg file will be less then the quality of a lossless compression method [such as GIF].

So If you have an image with best possible quality [supose you captured the image yourself ] .. then converting this image to a Jpeg file is likely to reduce the quality even if you choose the best available quality of jpeg method.

Jpeg method uses signal processing techniques by filtering out the bits from an image that takes a lot more space but convey significantly less information to the viewer. Quality is a measure to control how much you are willing to throw away ... Low quality means higher compression .. higher quality means low compression.

On the other hand there are few lossless compressions methods available . GIF is one of those. GIF does compresses a file to certain extent by using a method Run Length Encoding .. but since it works on straight streems of lines and does not takes into account of the 2D area of a picture .. it may not compress some types of images. BUt on the other hand it will not loose any quality no matter what.

Answer 3

The ability to manipulate the file decreases significantly, but in my experience the quality is not that detectable except in skin close ups, and other high detail images.

I have successfully used images saved as jpegs although bmps and tiff images are preferable. When I used a jpeg, I will have to do some channel adjustments and some minuscule use of blur.

But that's fine and I have no complaints about my work.

good luck.

Answer 4

12? You must mean "100%/highest quality". 12 sounds specific to the program you're using.

theoretically, the compression achieved in the jpeg algorithm is done in the FFT space by smoothing the curves, but this step need not take place. practically, almost all programs perform some sort of compression.

if you don't want any compression on an image, simply save it as another format. BMP or TIFF are usually uncompressed and most platforms can work with them.

Answer 5

nicely ,in spite of your saving an "unclear" image, in Photoshop, you may want to flow to document>keep As... and choose JPEG from the format drop-down menu. A communicate looks, supplying you with thoughts of high quality. lower than image thoughts, slide the slider all a thanks to the right: high quality = 12 (optimal). must be all there is to it.