Blue banding

Question

I have four blue bands on the display. There are two groups of two bands, each about half an inch long. For a particular screen resolution, they always appear in the same location (different location for different resolution/settings). When a window moves over the area, the bands "smear" over the moving window and remain there. The smeared bands are captured by a screen grab (if you need to see an image, I can upload one somewhere). The smearing occurs when the window below scrolls or is dragged past in any direction. When a new window is brought to the front, the banding resets to the original four.
Very frustrating. Is this a hardware or software problem? Have you seen this before? Any questions for me?
Thanks,
KTP
PowerBook G4 15"   Mac OS X (10.4.6)  

Answer 1

genadi_mak wrote:
I just tried to export a file from my old EP2 with the same settings as I always have done 100% quality and limited size of the file to 450KB using LR4.3. And, I see banding so, this is definately how LR4.3 compresses files vs whatever method of compression was done in LR3.
If you are using the same Export settings as LR3 then it's probably due to PV2012's more aggressive tonal controls. Try the same Export using LR4.4 using a few images adjusted using PV2010 to confirm.
genadi_mak wrote:
I experimented a bit and found that if I lower quality to 77% and Resize to Fit the photo to 1000X1000, I get the size of the file down to 350KB and good results on my 24" monitor but, will this be enough to print 4X6 if needed?
For best results most printers require 300dpi image files, which would be 1800x1200 for 6" x 4" prints, but you can get reasonable results down to as low as 150ppi (900x600).
genadi_mak wrote:
If I leave quality to 100% and Resize to 1000X1000 the size of the file increases to 650KB. This will result in page with photo catalog loading longer.
This is the opposite of what you should be doing to maintain the smallest files size. The only reason ro use a 100% Quality JPEG is if you plan on doing further editing to the file. Even when uploading files to a printer a 90% Quality setting is very adequate and will NOT show any difference in the final print. For the Web I have already suggested a JPEG Quality of 50 is adequate. Please read the article at the link Andrew posted and my comments.
Try an Export using sRGB, 50 Quality, 1000x1000 Image Sizing, and Screen Standard Sharpening. Look at the exported images in LR at 1:1 view for visual artifacts such as banding, then post  them on the web and look at them at full-size. They should look identical. If not let us know.