Sigma X3F 'Built-in' profile locked to 'Half' resolution

[DrJulian]

Firstly thank you for all your work on this great raw developer.

I'm using the latest RPP64_1937Beta.

Opening a X3F file from a Sigma SD Quattro requires the 'Built-in' profile be selected for best colour.

BUT the development is fixed to 'Half' resolution mode.

When selecting the 'Default' profile, development is fixed to a full resolution mode.

See attached screenshots.

When selecting the 'Built-in' profile either we need the choice of Half or a Full res mode, or the resolution to be fixed on a full mode. Currently no option is given, the interpolation box is empty.

[DrJulian]

A side-by side 100% crop comparison attached, from another X3F file.

The 'built-in' profile has jagged course results (the 'default' profile while the colour and tone is not correct, it has a fine smooth resolution).

[DrJulian]

I am providing a link to the two raw files as used above (WeTransfer link will last for 1 week)...

Download link
https://we.tl/t-0ZSZyanXEu

NB all the X3F raw files from my Sigma SD Quattro show the same problem when developed through RPP (not just these two files).

Just to repeat that again here :

RPP 'built-in' profile renders low-res jagged edges (this is a problem)

'default' profile renders smooth fine results.

Thank you.

[RPP]

Thank you for the files. X3F files are essentially RGB files from the beginning, they don't require interpolation and none is applied. 

That's why you don't see any choices in the Interpolation selector - it's always same 20MP RGB.

Switching between profiles doesn't affect resolution, only its perception - washed out colors look more smooth, more saturated look more grainy. Image data though has same amount of details. Default profile doesn't seem to work as expected and produces washed out colors. Probably this is the same kind of issues everybody  having after some macOS Monterey update. 

Built-in profile looks correct (at least as intended by Sigma).

Regards,

Andrey

[DrJulian]

Dear Andrey,

I can appreciate what you are saying about different profiles which may increase contrast (and variously through different colours) and so make detail look more contrasty - and so jagged.

But this is not the case here.

I have boosted the contrast and saturation of the 'default' profile to try and make the contrast harsher, and compared it to the 'built in' profile. See attached here.

While the contrast boost I applied to the 'default' profile does not make it an exact match for the 'built-in' profile, inspecting detail shows there must be more than colour profiling causing the harsh jagged issue.

The 'built-in' profile shows a doubling of detail, see the isolated dot in the attached example, it is bounded by a darker outline from the 'built-in' profile.

And see the long lines to the right, they are also 'stringed' with grating lines within them. This is not a contrast issue or colour profiling, it is rendering.

These are zoomed in 800% to make this apparent and obvious, but the issue is obvious to me at 100%.

Very best,

Dr Julian

[RPP]

My explanation still stands. We actually found that your sd quattro was misidentified as dp2 quattro and wrong profiles were applied.

This version should resolve the profile issue:

https://www.raw-photo-processor.com/RPP/RPP64_1939Beta.zip

Regards,

Andrey

[DrJulian]

Dear Andrey,

I tried the new version but there is now no Profiles menu item.

How do I select between 'Default' and 'Build-in' Profiles? See attached screenshot (latest version at the top)...

Very best

Julian

[DrJulian]

The detail or resolution still seems to be a half of that which is available in the X3F file.

See comparison, to that developed by Sigma Photo Pro / SPP, attached (very enlarged crop to make the extra resolution obvious).

The difference is not just sharpening, there is twice as much resolution in the file than is being shown in the RPP results.

Link to Sigma Photo Pro that I used in this comparison (in case you do not already have it for comparison),

https://www.dropbox.com/sh/s0sfxoxcpkqd84c/AAAPdpWaZLbEiIewMQYqH2y6a/SIGMA%20Software/PhotoPro6.7.2.dmg?dl=0

Very best,

Julian

[DrJulian]

...just to add to my previous reply, re: 'half resolution',

I am sure you are aware, but thought I would mention : the Foveon Quattro sensor only has the full-resolution on its top layer, this resolution is then applied to the lower two layers which are lower resolution 'quad' sized pixels.

Very best,

Julian

[RPP]

SD Qattro has only one profile, so menu Profiles is not shown - there are no other choices for this model.

Regards,

Andrey

On Thursday, December 1, 2022 at 10:40:18 PM UTC-8 DrJulian wrote:

Dear Andrey,