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Old Jan 14, 2007, 9:51 PM   #1
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couldn't really match these with any forum, but it seems to me photoshop people will have the answers.

1-is there any reason i shouldn't archive my photo cds with highMAT? do the images degrade in any way? is there information loss?

2-i know that if i open a jpeg frequently it begins to degrade but do stored jpegs on cd degrade? should they also be converted to tiffs before being burnt to cd? i use delkin archival gold disks.

3-when giving a client a low res cd of images from a portrait shoot, how low res should they be? obviously i don't want them to be able to print high quality pictures from the cd.
is 72ppi enough assuming they will be looking at them on a computer? how will that look on a tv if they use a dvd player?



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Old Jan 15, 2007, 2:33 AM   #2
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You can open a JPG a thousand times and there will be no deterioration. You only lose quality if you save, which involves a re-compression of the image.

Unless you write a CD to RW media in packet writing format they are "read only". So they can't be saved back to the CD in such a way that you affect the original.

If the files are already JPGs there is no advantage to converting to a loseless file type like TIFF for archive.

PPI or DPI is totally immaterial to your problem. What is significant is the size of the image in pixels. I would probably make the images 400 pixels on the longest side if you want to be sure they couldn't get a good print. A better alternative is to watermark the images, which you can do with any decent image editor.

I'm not familiar with HighMAT. If you can extract a full sized JPG back from the HighMAT recording it is probably OK. But it seems I have read of people having problems getting the pure full sized JPG back from the HighMAT recording. If your originals are important I would archive them as data using mastering software to good CDRs. It is good idea to have two sources for archived photos in any case.

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Old Jan 16, 2007, 3:15 PM   #3
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I had never heard of highMAT, so looked it up on Google. Seems it is a method of making images/video/music/sounds/... readable on standard DVD/CD players. I cannot see the point of that for archival storage of images: being able to read them with a computer is the reason for archival storage. In addition, how likely is it that the highMAT will be readable in several years? One of the biggest dangers of archival storage is that the media will not be readable in several years - would you care to try to read an eight inch floppy disk? A document saved in some obscure format on an obscure WordProcessing program on an Atari ST? Sticking to standard formats (e.g., JPEG images & ASCII text) will improve the odds of being able to read them in several years.
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