JPEG - maintaining image quality

Do JPEG images degrade each time that you them in photoshop, change the color space and save them.
Example: I receive a JPEG orignal file, change the size of the image and rename the original and save-as. A month later I open this new file and convert it to CMYK. Has the quality of the image degraded with these changes?
I will be using the images for large format printing and want the best quality.

A jpeg degrades every time it is resaved, yes. It makes no difference what you do before the save, it's the save itself that does the damage.
You can usually get away with one or two resaves, but it's good practice to avoid it altogether. If you receive a jpeg, resave it to tiff or psd immediately.
Edit: cross post

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Well, we have tried multiple times to import our Word files directly into RH in which the images were not satisfactory. So after going round and round with this...FrameMaker was introduces as a way to solve our image concerns. However, I do agree with you...it is very cumbersome. I just want to keep the higher ups pleased.

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Remember that Premiere's program monitor shows the images as video. If your sequence is interlaced, the program monitor may be displaying every other trace (this is a display option as I recall).
What does it look like when exported and viewed on a TV.
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If anyone has tips on how to improve the image quality of jpeg's in acrobat.com I'd really like to hear them. I've edited the images in Photoshop (CS4), exported them as jpeg's, and inserted them into my acrobat.com presentation. They look horrible, and there are many artifacts. If I insert the same image into Powerpoint, they look considerably better, but I'd prefer not to have to use it. Is there an image quality setting that I'm missing?
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Hi Rob,
Thanks for posting - and sorry you're having trouble. It sounds as though the image's quality is suffering because it's being down-sized upon insertion. In Presentations, any images larger than 1024 on a side are resized to fit within a 1024 bounds (we do this to optimize performance - important for a web application).
Here are some tips from one of our fine engineers:
For the best looking images, pre-scale your images to fit the size of the presentation before you upload them; for reference, the slide canvas is 720 pixels wide and 540 pixels tall. Any image larger than those dimensions is larger than it needs to be on the client so you and your audience are downloading more data than they will ever see. If you resize your images to fit the size it will appear on the screen, you will have a better looking image.
The choice of image format makes a difference at this scale as well. For image with smooth transitions like photographs of landscapes, jpeg is a good format. For computer generated diagrams like charts, or images with lots of details like text, PNG is a better format.
It is important that the image be scaled to the appropriate size before uploading because the server will recompress any image it needs to scale using JPEG compression. So if you are uploading a PNG image with transparency, you will loose any transparency effect if the image is large enough to require scaling on the server.
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Best regards,
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Very Poor Image Quality In Viewer, JPEG Artifacts

I upgraded to Aperture 3 some time ago, and purchased a new Mac Pro specifically for this application. I am an amature/ sometime professional photographer and I have been using Aperture since Version 1. This weekend I finally had some time to sit down with Aperture 3 for some serious work with my scanned film images. These are large TIF masters scanned in with my Nikon CoolScan 9000. Some are medium format black & white Tri-X Pan images, others are 35mm, also black & white Tri-X Pan. Everything scanned in on the Nikon is at the maximum resolution for the master, on the theory that I can always bump it down later if that's necessary.
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I interpret this as ... Eventually you should be looking at the Master with the Version changes applied. I'm assuming at this point, you aren't looking at the Preview. Since you don't need Previews to view and edit your images.
Yeah...that's sort of what I gleaned from that text. I was experimenting with the preview settings because I couldn't see any other way to fix the problem. What I'm hearing now is that the problem has no fix. If you scan in black & white film negatives (or anything else that's monochrome I suppose) with the color space set as gray scale you are asking for trouble. The sense I get from the text Gomez Addams referred me to is the behavior in that case is unpredictable, and furthermore film photographers aren't the customer base Apple is trying to cultivate with this product.
Aperture is designed to work with images from digital cameras which use an RGB color space...
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Aperture is designed to work with images from digital cameras...
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Until yesterday, when saving an image as a JPEG I would click "Save As", select my folder and the Image Quality dialog box would pop up and I would then select 12/Maximum as the image quailty and hit "OK". Thereafter, every time I saved an image, Photoshop applied the same settings as the previous save i.e., 12/Maximum was pre-selected and I would just hit OK and move to my next image.
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AFAIK jpeg quality settings are sticky per file, not globally (at least inside Photoshop, but that association may not transfer between applications).
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Hi:
Does anyone know whether using the 'save metadata' feature in LR to save changed metadata to a JPEG file will result in a resaving of the entire file and/or otherwise degrade the JPEG image quality?
If it does not degrade the image quality, how does this feature work?
Many thanks for the help

Each pixel remains unchanged in this process.
I was under the impression that any re-saving of a jpeg image results in a slight loss of quality, regardless of whether there have been changes to the image
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Hi,
Unfortunately,this setting applies only to pictures in the current file or the file selected in the list next to Image Size and Quality.Please take a look the article below:
http://office.microsoft.com/en-001/excel-help/turn-off-picture-compression-HA010355184.aspx
Wind Zhang
TechNet Community Support

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JPEG - maintaining image quality

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