astrophoto denoise!!
and I’m starting to get local contrast now, thanks again
astrophoto denoise has not much impact on this pic. It is one of my standard settings to suppress noise in blue sky. On a pic like that you can just switch it of. Local contrast is one of the most important tools for me.
nice play, your cut out is super clean
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First the plugin and then the manual tinkering
how did you do the separation?
At first and second look DT sharpening, as evidenced by yours, @paulmatth 's and @Popanz ’ editing expertise, seems to be adequate for a sharpness challenge like this, vs. the chaiNNer AI et.al. route. Would you agree?
I’m also speculating about how the pixels from either method behave when printed and will test that later on.
Thanks Thomas, I do like the crop you made but it remains a messy frame for reasons mentioned in my other comments, nothing to do with your development and editing choices.
Blue shirt guy definitely needs a dress code check and the lorry and building behind a paint job to match the palette of the group and that handheld fan. So I’m leaning towards monochrome as a first attempt. Jubilant Stretch is extra lovely in your lighting though.
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thanks - I didn’t know about HRQ at all so that was interesting. Couldn’t find it in the manual at first try
Didn’t really work for this scene IMHO and there’s a small but noticeable unflattering shading under her chin now I’d be hesitant to share with any portrait subject.
You can find high-quality resampling among the export settings.
When you are working in the darkroom, darktable will, be default, render only the visible part of the image, and will downsize the image as early as possible, running calculations on the downsized image. This saves on resources, but it also means the size of the preview window and the current zoom level influence the processing result. There is now a button to force full processing:
Now, when you export, there are 2 choices:
- high-quality resampling on: the image will be processed at full resolution, and resized to the desired output size at the end (just like in the darkroom, provided that the full processing setting is used there, too);
- high-quality resampling off: based on the desired output dimensions, the image is downsized as early as possible, and processing is done on the downsampled image. This is similar to the darkroom, with the full processing setting disabled. The processing results may vary with output size (just like in the darkroom, where they depend on the zoom level and window size).
The only ways to make sure the darkroom and the exported image match up are:
- process with an editor window, where the editor preview’s dimensions match your export dimensions, disable full processing in the darkroom, export with high-quality resampling disabled
- enable full processing in the darkroom, export with high-quality resampling enabled.
Fortunately, the differences are usually not so great, but if you get an export that does not match up with the darkroom, you will now know how and what to check.
2 Likes
@kofa as always explains things very well… I recently was messing around with a playraw and it was a good example of how you can perceive the impacts of these two…
Here is the image with HQR export setting at no…
And then with yes…
_MG_0221.CR2.xmp (41.1 KB)
Viewing the images zoomed out to full screen the one with the setting at no at first can give the impression of much more detail say in the ropes and for the pain and wear and tear on the boat… but when you zoom in you can see very obvious artifacts that are corrected or absent in the image with HQR set to yes…
At 200%…
Look in that same area and note the black edge and no smooth transition in the blue away from that area…likely revealing the diffuse or sharpen impact…
So zoomed out it can often look like setting it to no might be a “sharper” image but if you zoom in you can often see some artifacts… I think the overall result will vary with the modules used and the degree to which you scale the image…in this case I made these observations on an image downscaled to 1920 on the long edge…
3 Likes
thanks a lot - I’ll look for other examples and HQR discussions in other threads and try to figure out a general approach.
I think it’s mostly an issue if you scale your export. With full size exports there is not much difference in the exported file it’s just the preview that wouldn’t match as well when zoomed out if you don’t use the hq preview toggle to check…
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thanks!
So I’ve got a 3000x2000 3:2 display (13.5")
RAW files at either 16 (4:3) or 24MP (3:2)
90% of darkroom exports are 2-4MP JPGs for web
10% print, mostly 10x15cm/4x6in, some 15x21cm (A5)
For web JPGs would that be either:
- any size needed with full processing, visible at any zoom level, and HQR export
- editor window about max. 2000x2000 without full processing and no HQR export
- same as above for smaller sizes, editor window adjusted accordingly
First option might choke the old 8GB RAM i7, to be tested.
I normally edit without full-resolution processing (but sometimes zoom to 100% – not the whole image gets processed, only the visible part, so it’s much faster than processing the whole image at full resolution; a good compromise), but export at ‘web size’ (2k-ish) with high-quality resampling on. In the rare case it comes out too different, I check the edit in full-res. I have plenty of RAM and an old, but working GPU (NVidia 1060 with 6 GB), and my cameras are old (10 and 16 Mpx).
hasty attempt, with @dqpcoxeas ’ sharpness mask on Happy, everything else from scratch.
Her halo is now from a vignette which didn’t make it through the export it seems.
The JPG export is Upscayl upscaled with remacri and then downsampled in nomacs for web.
Messed around with retouch module (docs.darktable.org) on the pole mast thing without any prep or clue, to be continued
I’m leaving it here so for now, to be revisited when my DT skills level-up and the monitor is better calibrated.
Thanks for all the entries, I learned a lot and will notify you if something from your xmp merges into my revisions.
These are DT exports without HQR:
Heimholtz/Kohlrausch monochrome LUT
Best preset title ever
