Maze pattern in digital images

[jotloob]

I recently stumbled over an issue with my little LUMIX G1 looking at the images at 400% magnification in PSCS3/4 .
In the top and lower corner of the right part of the image , and only there , I discoverd a maze pattern , when the RAW file was converted either using LR2.4 or ACR5.4 . SILKYPIX , which comes with the G1 does not show this issue .

So far a short background . I have reported the issue in the ADOBE forum .

Today , I have inspected some files taken with my CFV and the RODENSTOCK 4,5/35mm DIGITAL lens .
(the wider the angle of the lens , the better the issue can be seen) .
They show the same maze pattern , when converting the 3FR RAW using either ACR or LR .
The maze pattern is not seen , when using PHOCUS .
This smells very much like an algorithm issue in the ADOBE software .

SO, why this thread here ? ? ?

Easy .
I would like to ask those of you , who use HASSELBLAD digital cameras or backs , to check if you get the same maze pattern .

If you are willing for a check , simply do the following .
Best you just shoot an image of a blue or grey sky . (widest angle lens you have) .
Convert that image to a TIFF file , using PHOCUS and also ACR or LR .
Save the files and open them using PSCS .
Inspect the right top and bottom corner at a magnification of 300% or higher .

For those of you who have to enlarge their images very much , this might turn out to be a severe issue .

I will supply a maze pattern later .

Jürgen

 

[jotloob]

Maze pattern

ADOBE CAMERA RAW in PSCS4 only , off course .

But the issue can be seen with PSCS3 and PSCS4 .

The first sample was converted using LR2.4 and shows the maze pattern all over the image and can already be seen at 66,7% .
View attachment 1538

The second sample is converted with PHOCUS1.2 .
View attachment 1539

Both samples are a crop out of the 400% magnified image .

Also you can see , that the colors are different between the LR2.4 and PHOCUS1.2 converted image .
No manipulation is done in any way to the samples .

 

[rquindry]

Maze Pattern

I've run across the same pattern with my CFV processed in Flexcolor. In my case it seems to show up when clients ask me to shoot low contrast mostly white and clear products on white plexi. I can get rid of it in Flexcolor by using a little lower USM with a grain limit set to 5, Color Noise to 5 and Noise Bias to 2. It's like the software is hunting for something to make it sharp and goes overboard.

Hope this helps.

Rich Quindry

 

[stever]

Gee, I do not have this problem with film.








I guess I should save my money and not buy a digital back.







My Bad.

Steve

 

[polypal]

Another good reason to stick with film..........

 

[jotloob]

I've run across the same pattern with my CFV processed in Flexcolor. In my case it seems to show up when clients ask me to shoot low contrast mostly white and clear products on white plexi. I can get rid of it in Flexcolor by using a little lower USM with a grain limit set to 5, Color Noise to 5 and Noise Bias to 2. It's like the software is hunting for something to make it sharp and goes overboard.
Hope this helps.
Rich Quindry

Rich

Thank you for your answer .
Of course , I use the same parameters for USM and size in both , PHOCUS and LIGHT ROOM .
I shot a new test image yesterday evening with the 905SWC+ CFV .
When converting the 3FR file to tiff using LR2.4 I now get the maze pattern all over the image . To be seen at 400% magnification in PSCS . Additional to that , a stripe (three pixels wide) in the upper third of the image is generated . That stripe exists over the entire width of the image .

Converting the very same 3FR file , using PHOCUS produces a failure free image .

Again , I realize , that this is of course no HASSELBLAD issue .
I wanted to know , if somebody else has ever experienced that issue using LR conversion of the 3FR file .

If someone of you guys out there would like to test this , I will be happy to assist you .

Thank you .

Jürgen

 

[jotloob]

ADOBE has informed me , that with ACR5.5 (beta) the issue is olved for the LUMIX G1 , which is true .
The LR2.4 fix will be available soon and the fix for the HASSELBLAD issue , I forwarded to them will be available with the next ACR release .

I am glad that the issue was recognized as such by ADOBE and that forum users now can see that I had no hallucinations .

Jürgen