Forum: Photography

Subject: Photoshop 7 question (problem) URGENT!

zhounder opened this issue on Jan 20, 2003 ยท 18 posts

zhounder posted Mon, 20 January 2003 at 7:39 PM

I just loaded PS7 last night and then played around with a few images. Some I only opened. Now all the imagaes I opened in PS show a type of RGB 'dust'. This was not on the original image! It is now though! I always duplicate the image and then work on the dup. No saves or changes on the originals, just open, copy and close. Now all of this show this 'dust' (see attached image). Has anyone seen this before or know if the update to 7.01 is going to stop this from happening? Any help would be gtreatly appriciated. Magick Michael

Slynky posted Mon, 20 January 2003 at 7:48 PM

that is truly odd.... nope, I'm of no help, sorry bro. Try the update, and then retransfer the images to the puter and try again (if you can), see what hapens after reopening them a second time.

EricofSD posted Mon, 20 January 2003 at 8:32 PM

Attached Link: http://www.mediachance.com/digicam/index.html

Those look like pixel hot spots typical of some low light shots with digital cameras. Dunno why PS would be doing that. Do they show in other viewers besides PS? There's a hot spot fixer at this link, but it isn't very good.

Misha883 posted Mon, 20 January 2003 at 10:15 PM

I can't see them... time for me to calibrate the monitor again... Speaking of which, you likely need to run through adobe's monitor calibration again after loading a new version of photoshop...

EricofSD posted Mon, 20 January 2003 at 10:32 PM

Look closely. There are white and blue and red pixels in there.

EricofSD posted Mon, 20 January 2003 at 10:36 PM

That's from digital cameras that can't deal with low light conditions. I doubt PS introduced those, but PS might well show them. I see this in PS 5.5 as well but I don't see this in other image viewers. They're still there though. They can be changed one pixel at a time with the eyedropper and brush tool. The quality of the camera at low light has all the world to do with this. Now I'd be surprised to hear if these were flatbed scanned photos. Shouldn't happen with that.

zhounder posted Mon, 20 January 2003 at 11:18 PM

I agree that some low light shots will show with adigital camera. However, the Blue & Red were not there last night. I swear they weren't. I have an image that I saved from the exact same copy that the above came from and it shows nothing. It does show in all viewers I have, PS6, PS7, ACDSEE, and Lviewpro. I tool it back to PS6 and cleamed up each dot. Took 2.5 hours. I will post that image in another thread. Wierd. Thanks all! Magick Michael

EricofSD posted Mon, 20 January 2003 at 11:29 PM

hmmm, well, this makes we wonder then if PS does introduce pixel problems. What format were you saving in? .psd and jpg compress a lot, but jpg distortion is not a single pixel thing, its a group of pixels.

Misha883 posted Mon, 20 January 2003 at 11:29 PM

They are there if I brighten things up...

zhounder posted Mon, 20 January 2003 at 11:37 PM

I saved them in PSD but the funny thing is that the original noncompressed JPG (from the camera) had the same problem and it was never saved once, downloaded from the camera it was clean. That is what is so wierd. Oh well, PS6 works and I am sticking with it. MM

EricofSD posted Mon, 20 January 2003 at 11:46 PM

Try opening a good pic and saving in .bmp format and see what happens. I don't think bitmaps compress. There is ALWAYS data loss in compressions.

Misha883 posted Mon, 20 January 2003 at 11:47 PM

It's not on your older posts. Here I adjusted levels in order to emphasise anything. Nothing. Incompatability between jpeg encoder in camera, and jpeg decoder in PS7???

EricofSD posted Tue, 21 January 2003 at 12:38 AM

Well, if you see this as a PS6/7 issue then that's a kewl observation.

starshuffler posted Tue, 21 January 2003 at 3:54 PM

Hmmm, you might try asking retrocity, Photoshop Forum mod, too. He might be of help. ;-) (*

DHolman posted Wed, 22 January 2003 at 4:36 AM

Wow..I've never seen anything even remotely like this under PS7 or any PS for that matter. Weird. -=>Donald

Cheers posted Wed, 22 January 2003 at 3:08 PM

Take some pictures with the camera in a totally dark room, or with the lens cap on, at different zoom settings, shutter speeds, exposure settings, compression settings and at different CCD pixel resolutions...that way you should be able to see if you do have hot pixels in the CCD of the camera. I must admit that the blue "blotches" do look like compression artifacts to me though. Cheers

 

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Cheers posted Wed, 22 January 2003 at 3:14 PM

Ohhh, the "spots" also have JPEG artifacts around them, so if any of the images above are original images then the spots were created within the camera. Cheers

 

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Six_Eyed_Smily posted Mon, 27 January 2003 at 5:52 AM

"Try opening a good pic and saving in .bmp format and see what happens. I don't think bitmaps compress. There is ALWAYS data loss in compressions" not true - some image formats use what is called lossless compress - compression that does not involve data loss. for example, lzw compression in the .tif format. i think .png is lossless as well, and gives better compression than .tif