Saving jpeg

[rozmbow]

The main use of my images is for Microstaock.
My current work-flow is like this - I take pictures in RAW, Open them in Adobe Camera Raw, make the basic PP, open it PSE 6, finish the PP and save as jpeg.
I have to change the "file info" - metada - keywords. Usually I do it at a later stage - open the jpeg image, enter keywords and some "file info" and save a final jpeg.
I read somewhere that I am loosing some information and the quality of image goes done. Is it correct? Should I do all (PP + file info) at the same time? Is really critical to do it like this or is the degradation in quality is marginal only?

[dj_paige]

Each time save a .jpg, the quality goes down. That's the way .jpg works. Depending on your quality settings and the size of the photo, the loss of quality may or may not be noticeable to human eyes. One way to check is to do a test, do your post-processing and then save an image as .psd instead of .jpg ... then go ahead and do your usual work flow, save as .jpg, open it up, edit the keywords, save as .jpg again; and compare the .psd to the end result .jpg.

[Priyanka Azad]

The amount of loss you suffer from JPEG compression is very much a function of how many times the file is edited and saved. Every time you resave an edit, it uses the compression algorithm again, which costs you more image quality. My experience has been that you have to go through several such cycles before the image starts looking obviously worse. Still, it is not ever a good thing to do if you can avoid it.

The best would be to save it as a PSD, make all the edits you wish to and finally save it as a jpeg only once.