Phocus and LCC: strange artifacts

[mristuccia]

Right, that is probably not a default setting (the checkerboard removal) I guess (?), because mine has seemed to always be on, even with upgrading Phocus numerous times - I'm guessing if you check that and upgrade, it may hold for your upgraded version, because I don't recall manually turning that on for some time now.

Magenta cast can simply be a bridge too far sometimes, as far as how much of it is removed, depending upon the lens and the amount of shift.


Steve Hendrix/CI

Thank you for the confirmation Steve. Much appreciated.

 

[rdeloe]

By the way, if anyone wants to try himself, here is a link to my Google Drive containing the image and its LCC:

https://drive.google.com/drive/folders/1GUfpRh7mrCSl_pz6ypwKdLjT5SfGWwW-?usp=sharing

Thanks again for your help.

I did scene calibration in Phocus and flat field correction in Lightroom. In both, there was no mazing. In Phocus, I didn't do anything special. There is a strong magenta cast, but I made it disappear in the LR version using the Point Color tool and small shifts in Hue and Saturation.



Side note: I always like seeing how Phocus does a Hasselblad file versus how Lightroom does. In a side-by-side comparison, it becomes obvious how heavily Hasselblad has worked the tone curve to lift shadows and lower highlights.

 

[vjbelle]

I don't use Lightroom but based on how you corrected the cast I would think that the Point Color tool is similar to 'Replace Color' in PS. 'Replace Color' is very global and at times just cannot be used. You have piqued my interest in trying to use Lightroom.....

Victor B.

 

[rdeloe]

I don't use Lightroom but based on how you corrected the cast I would think that the Point Color tool is similar to 'Replace Color' in PS. 'Replace Color' is very global and at times just cannot be used. You have piqued my interest in trying to use Lightroom.....

Victor B.

It's a recent and very useful addition. I have no idea how it compares to tools in PS.

You can use it globally or in a mask. I used it globally to make a quick-and-dirty change. You click on a pixel and then adjust hue, saturation and luminance. There are additional controls for expanding or contracting the range to which the adjustment applies. It works the same way in masks, so I could have restricted it only to the sky by doing a sky select and then Point Color adjustment. That's how I use it when I'm making edits that matter.

 

[mristuccia]

[...] In both, there was no mazing [...]

Uhm... that's odd. Do you have the checkerboard removal flag on in Phocus? That's the only explanation I have.
Second explanation could be a different platform (Windows vs macOs Intel vs macOs Apple Silicon). I'm on Apple Silicon (M3 MAX).

There is a strong magenta cast, but I made it disappear in the LR version using the Point Color tool and small shifts in Hue and Saturation.

Indeed magenta cast is not a real concern for me as it was instead the mazing. As you just proved, cast can be removed, at least on skies where it is very noticeable.
Thanks for trying it out!

 

[jotloob]

I have never heard of a PHOCUS function "REMOVE CHECKERBORD PATTERN" and also can't find it in the newest PHOCUS manual .
Perhaps it is hidden under a different name .

I use a HR DIGARON -S 28mm and a maximum shift of 8mm here , altough 11mm for a 33x44 sensor would be possible .
Also I use the HR DIGARON -W 40mm with shifts up to 18mm (20mm would be possible) . Never saw a "checker board pattern" .

All LCC shots could easily be used in PHOCUS scene correction .

 

[mristuccia]

All LCC shots could easily be used in PHOCUS scene correction .

Not so easily in my personal experience. But maybe it is only the combination with my sensor. And, by the way, my example was 14mm shift on the long side of the sensor...
And the lens is an SK 35 XL, not a Rodie.

I have never heard of a PHOCUS function "REMOVE CHECKERBORD PATTERN" and also can't find it in the newest PHOCUS manual .
Perhaps it is hidden under a different name .

Here it is:

 

[jotloob]

Hello Marco

Thank you for your info . Found the" checkerboard patterns" function . I use the german version of PHOCUS and here it is called "SCHACHBRETT MUSTER"
It is hidden under "Rauschfilter" . Nothing found with that "SCHACHBRETT" in the PHOCUS manual either .

As for the LCC filter , I will come back with my details later . Hope that is ok .

 

[rdeloe]

Uhm... that's odd. Do you have the checkerboard removal flag on in Phocus? That's the only explanation I have.
Second explanation could be a different platform (Windows vs macOs Intel vs macOs Apple Silicon). I'm on Apple Silicon (M3 MAX).

Yes, that flag was on. I didn't turn it on! But it was on.

 

[mristuccia]

Yes, that flag was on. I didn't turn it on! But it was on.

Well, it seems that I'm the only one having this flag set to off by default.

 

[jotloob]

No , Marco , me too . That flag was off by default since I have PS . And I did not even know about its existance .

 

[SylB]

Me too, Marco. Never seen, never used ! Thanks for pointing that function out !

 

[mristuccia]

Me too, Marco. Never seen, never used ! Thanks for pointing that function out !

Thanks go to @usm.

 

[TechTalk]

I have never heard of a PHOCUS function "REMOVE CHECKERBORD PATTERN" and also can't find it in the newest PHOCUS manual .
Perhaps it is hidden under a different name .

In the current Phocus Manual it's discussed under Noise Filter on Page 58.

 

[usm]

And don’t forget to turn off autorotation in the camera before shooting! Otherwise you will have non removable pattern when shifting left/right in portrait mode. It’s a bug. Please report to Hasselblad - so I am not the only one