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Invisible/Diagonal line going through canvas


OneFootBazooka said:
It's funny when I normally save a file, let's say as a jpeg, there appears to be nothing wrong. It's only when I have a file opened in photoshop that this line will appear. I had to printscreen for both images to be able to show you guys on here, otherwise it would have looked normal. But I actually did try resaving some files and it's still happening.
Click to expand...

Wait, are you saying the problem is only on the screen and not on saved file ? Does it mean when you save the file in Photoshop, which has the line, and open it in something else it is OK ?
Just to clarify,
Peter
 
I already disabled OpenGL like I said in my first post :P I just updated my graphics card driver, still nothing.

peta, yes, it's only on the workspace (canvas) in photoshop that this line will appear and not on a file that I can open outside of photoshop. For example, when I open a file that I saved in photoshop with windows preview such as a jpeg, png, etc., it looks perfectly fine with no line going through it. So the problem is with the photoshop workspace, only in the canvas area.

So anyway, I'm going to try to reinstall photoshop right now and see what happens.
 
Ok, so I tried turning off OpenGL again and closed the program. Opened it back up, the line was gone but now images are low quality because of the lack of anti-aliasing I'm assuming.

EDIT: It's a zoom issue and the image will look fine at intervals of 25% zoom. Any other percentage of zoom in between looks terrible.
 
Last edited:
Well anyway, even if that doesn't get resolved, thanks for the help guys at least I can work around the zoom issue somewhat and sorry about the OpenGL thing. I didn't know I had to restart photoshop in order for it to take effect.
 
OneFootBazooka said:
EDIT: It's a zoom issue and the image will look fine at intervals of 25% zoom. Any other percentage of zoom in between looks terrible.
Click to expand...

Actually that's normal:
Photoshop uses pixel binning for displaying % zooms - so at 50% zoom its just nice and cleanly chucking out every other pixel... keeping 1 in 2 pixels... at 25% its just keeping every 4th pixel... 1 in 4....
But at 66% its having to drop approx 1.5 in 4 pixels... well you can't cut screen pixels in half. So you end up dropping (approx) 3 in 8 which is an uneven drop... keeping the first, keep the 2nd drop the 3rd keep the 4th bin the 5th keep 6th keep 7th bin 8th.... this leaves 2 pixels aligned as they should and a judder as the image shoves up for the gap left by the 3rd then as there is some sections which are 1 pixel on and one off the gapping compaired to the on on off is diffrent. This is reapeated accross the width of the screen making smooth diagonals look jaggady!
The reason a £400 app does this is for speed only (comming from slow PCs -photoshop on a 60MHz 16MB pentium)... in the day speed was crucial and waiting another 45sec for the screen to redraw just a tiny bit nicer was not gonna happen when you got stuff to do! - and you work at 100% where the display is true... I don't know about the latest CS5 intergration with NVIDIA this might bring a real time AA filter to the size reprocessing.. .i dunno I have not tryed CS5.

From DPReview.com

 
Steve said:
Actually that's normal:
Photoshop uses pixel binning for displaying % zooms - so at 50% zoom its just nice and cleanly chucking out every other pixel... keeping 1 in 2 pixels... at 25% its just keeping every 4th pixel... 1 in 4....
But at 66% its having to drop approx 1.5 in 4 pixels... well you can't cut screen pixels in half. So you end up dropping (approx) 3 in 8 which is an uneven drop... keeping the first, keep the 2nd drop the 3rd keep the 4th bin the 5th keep 6th keep 7th bin 8th.... this leaves 2 pixels aligned as they should and a judder as the image shoves up for the gap left by the 3rd then as there is some sections which are 1 pixel on and one off the gapping compaired to the on on off is diffrent. This is reapeated accross the width of the screen making smooth diagonals look jaggady!
The reason a £400 app does this is for speed only (comming from slow PCs -photoshop on a 60MHz 16MB pentium)... in the day speed was crucial and waiting another 45sec for the screen to redraw just a tiny bit nicer was not gonna happen when you got stuff to do! - and you work at 100% where the display is true... I don't know about the latest CS5 intergration with NVIDIA this might bring a real time AA filter to the size reprocessing.. .i dunno I have not tryed CS5.

From DPReview.com
Click to expand...

Great explanation, just one slight correction, we are in 2D so 50% is 1 in 4(2x2) and 25% is 1 in 16(4x4).
 
I had more issues than Photoshop on my computer the next day, so I re-installed Windows and now everything works fine again. Not even having issues with OpenGL anymore :D
 
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