Re: [darktable-user] sharpening with "deep sky" methods?

On Fri, Nov 12, 2021 at 5:33 PM Terry Pinfold wrote: > I have found this publication which may give some insight into the > sharpening techniques used for hubble images. I suspect some of the > developers can understand the complex formulas and weave their magic. > > > https://www.researchgate.ne

Re: [darktable-user] sharpening with "deep sky" methods?

Google finds that this subject came up long ago (see third case study bullet here) https://darktable-devel.narkive.com/7Bual2Yk/deconvolution-and-python-framework This is what they call "deconvolution". It is well known.First you need a "point spread function" (PSF) for your out of focus imag

Re: [darktable-user] sharpening with "deep sky" methods?

I have found this publication which may give some insight into the sharpening techniques used for hubble images. I suspect some of the developers can understand the complex formulas and weave their magic. https://www.researchgate.net/publication/252709898_APEX_blind_deconvolution_of_color_Hubble_s

Re: [darktable-user] sharpening with "deep sky" methods?

If you have a description what exactly the procedure does (no marketing stuff, technical details, algorithms) someone might try to do so. But in meantime you can have a look at https://darktable-org.github.io/dtdocs/en/module-reference/processing-modules/diffuse/ a new sharpening module in the

Re: [darktable-user] sharpening with "deep sky" methods?

Am 12.11.21 um 09:17 schrieb Dr. A. Krebs: Dear all: I just came across a potentially new sharpening procedure on "Profifoto" magazine: . (in German language) According, it is transferred into a PS pl

[darktable-user] sharpening with "deep sky" methods?

Dear all: I just came across a potentially new sharpening procedure on "Profifoto" magazine: . (in German language) According, it is transferred into a PS plugin. Maybe it is possible to adapt it for

Re: [darktable-user] Sharpening

On Wed, 7 Aug 2019 09:42:09 +0200 Markus Jung wrote: >> I have spent the whole afternoon on it and found that the problem >> is DT, more specifically, the export with the scaling down. When I >> set the export scaling to 0, it's plenty sharp enough. > >Did you enable "high quality export" in th

Re: [darktable-user] Sharpening

> I have spent the whole afternoon on it and found that the problem is > DT, more specifically, the export with the scaling down. When I set > the export scaling to 0, it's plenty sharp enough. Did you enable "high quality export" in the settings? Explanation: With HQ export, the pipeline process

Re: [darktable-user] Sharpening

I don't think that is the way to go for simple but decent sharpening. Just like in Gimp or any other (raw) software, the current slider should be enough for 99% of all sharpening. But there is something in this module imo is not working exactly right. Op 07-08-19 om 03:49 schreef Jason Polak:

Re: [darktable-user] Sharpening

On Tue, 6 Aug 2019 21:49:14 -0400 Jason Polak wrote: >I would suggest combining your sharpening technique with various >levels of the equalizer module. If you drag up the histogram in that >module, it will give coarser levels of sharpening, depending on how >far left you start. So while basic sha

Re: [darktable-user] Sharpening

I would suggest combining your sharpening technique with various levels of the equalizer module. If you drag up the histogram in that module, it will give coarser levels of sharpening, depending on how far left you start. So while basic sharpening takes care of the fine detail, the equalizer can ob

Re: [darktable-user] Sharpening

focus points so that I do not have to focus and recompose. AndrewSent from Samsung tablet. Original message From: Carlos Arigós Date: 7/8/19 9:02 am (GMT+10:00) To: darktable-user@lists.darktable.org Subject: Re: [darktable-user] Sharpening Someone, some time ago, sent me this

Re: [darktable-user] Sharpening

Someone, some time ago, sent me this style. Try it Carlos El 6/8/19 a las 17:42, darkta...@911networks.com escribió: On Tue, 6 Aug 2019 20:52:01 +0200 Kneops wrote: I'm also struggling with sharpening in DT from time to time. Lately I just couldn't get my images (Nikon D850) to look sharp, s

Re: [darktable-user] Sharpening

On Tue, 6 Aug 2019 20:52:01 +0200 Kneops wrote: >I'm also struggling with sharpening in DT from time to time. Lately >I just couldn't get my images (Nikon D850) to look sharp, so I ran >the images through the Iridient N-Transformer which converts them >to .dng images. Those images were very sharp

Re: [darktable-user] Sharpening

I'm also struggling with sharpening in DT from time to time. Lately I just couldn't get my images (Nikon D850) to look sharp, so I ran the images through the Iridient N-Transformer which converts them to .dng images. Those images were very sharp and detailed. In DT I tried to mimick that sharpn

Re: [darktable-user] Sharpening

On 8/6/19 10:51 AM, darkta...@911networks.com wrote: > ... > Any suggestion for good sharpening tutorials? I keep this in bookmarks: https://redskiesatnight.com/2005/04/06/sharpening-using-image-magick -- Šarūnas Burdulis math.dartmouth.edu/~sarunas signature.asc Description: OpenPGP digital

[darktable-user] Sharpening

DT 2.6.2 on Opensuse Leap 15.1 Last night, I was talking with a friend and she commented that many of my images were not sharp enough. When I reprocessed a couple through Rawtherapee, they were sharp enough. This means that I'm not doing a good job of the sharpening in DT. I have tried both the

[darktable-user] Sharpening on export

DT 2.4.3 Is there a way of sharpening on export? Currently, I use mostly the highpass module for sharpening. It does an excellent job for full-size exports, but it's not that great when I shrink the exports (usually it's in the 900 to 1000 pixels range). I'd like to sharpen after shrinking eithe

Re: [darktable-user] Sharpening after resize

well, of course, if the feature was implemented in Darktable, the work flow would be easier and cleaner. On 17/11/2017 17:12, FK wrote: > Am 15.11.2017 um 17:38 schrieb Lorenzo Bolzani: >> >> The very fact that you need a second program, o a second manual pass >> with a find -exec DT, means, to m

Re: [darktable-user] Sharpening after resize

With all due respect to the great work of the developers, I agree: +1 Emanuele On Fri, Nov 17, 2017 at 5:12 PM, FK wrote: > Am 15.11.2017 um 17:38 schrieb Lorenzo Bolzani: > > > The very fact that you need a second program, o a second manual pass with > a find -exec DT, means, to me, that som

Re: [darktable-user] Sharpening after resize

Am 15.11.2017 um 17:38 schrieb Lorenzo Bolzani: > > The very fact that you need a second program, o a second manual pass > with a find -exec DT, means, to me, that something is wrong for such a > simple and common task. >   +1 ___

Re: [darktable-user] Sharpening after resize

* darkta...@911networks.com [11-15-17 13:01]: > On Wed, 15 Nov 2017 09:55:42 -0800 > darkta...@911networks.com wrote: > > > >I use mogrify for shrinking the file size, sharpening and adding a > >frame with a copyright. Then I use exiftool to remove the DT > >information and to add the missing ip

Re: [darktable-user] Sharpening after resize

On Wed, 15 Nov 2017 09:55:42 -0800 darkta...@911networks.com wrote: >I use mogrify for shrinking the file size, sharpening and adding a >frame with a copyright. Then I use exiftool to remove the DT >information and to add the missing iptc info. > >. >mogrify -quality 70 -unsharp 1.5x1

Re: [darktable-user] Sharpening after resize

On Wed, 15 Nov 2017 18:12:56 +0100 Remco Viëtor wrote: >As suggested elsewhere, there are possibilities to do the >post-downsize sharpening as a batch process. Or even through a Lua >script within DT. Since I know nothing about Lua, does somebody have a sample for how to call a command line comm

Re: [darktable-user] Sharpening after resize

On mercredi 15 novembre 2017 16:35:10 CET Lorenzo Bolzani wrote: > 2017-11-14 8:03 GMT+01:00 : > > On Mon, Nov 13, 2017, at 22:29, Lorenzo Bolzani wrote: > > > I'm quite sure that all processing is applied before downscale (this has > > > been discussed before). And sharpening is mostly lost after

Re: [darktable-user] Sharpening after resize

2017-11-15 16:55 GMT+01:00 GianLuca Sarto : > My presets for export produce a full size unsharpened tiff, and then I > move to Gimp to resize/sharpen for printing or website. > > The Gimp part can be done with a batch process. > This is not true if you are using masks or parametric masks with sha

Re: [darktable-user] Sharpening after resize

On mercredi 15 novembre 2017 16:55:34 CET GianLuca Sarto wrote: > My presets for export produce a full size unsharpened tiff, and then I > move to Gimp to resize/sharpen for printing or website. If you do it as a batch process (with fixed parameters for all files in the batch), you might be inter

Re: [darktable-user] Sharpening after resize

My presets for export produce a full size unsharpened tiff, and then I move to Gimp to resize/sharpen for printing or website. The Gimp part can be done with a batch process. On 15/11/2017 16:35, Lorenzo Bolzani wrote: > 2017-11-14 8:03 GMT+01:00 >: > > On

Re: [darktable-user] Sharpening after resize

2017-11-14 8:03 GMT+01:00 : > On Mon, Nov 13, 2017, at 22:29, Lorenzo Bolzani wrote: > > I'm quite sure that all processing is applied before downscale (this has > > been discussed before). And sharpening is mostly lost after downscale. > > This depends on whether "do high quality resampling durin

Re: [darktable-user] Sharpening after resize

To my knowledge, all pixel destructive operations like "resize" and "sharpen" should be done only once, in this order, as last action, and in accordance with the destination output (screen, paper). -Gian On 15/11/2017 05:43, I. Ivanov wrote: > Is it a "limitation" that resizing has to be last or

Re: [darktable-user] Sharpening after resize

Is it a "limitation" that resizing has to be last or it has never been considered as a need? Somebody mentioned about turning on "high quality resampling during export" However https://www.darktable.org/usermanual/ch08s02.html.php says that if the option is on then resampling is the last opera

Re: [darktable-user] Sharpening after resize

On 2017-11-14 09:18, Paul Deverson wrote: > Personally, I don’t sharpen in dt at all. I export unsharpened to a > tiff and then pre-sharpen using Nik Sharpener inside GIMP and then > output sharpen using Nik after resizing. > > Works for me! Yes, of course that's an option. When using other softw

Re: [darktable-user] Sharpening after resize

Personally, I don’t sharpen in dt at all. I export unsharpened to a tiff and then pre-sharpen using Nik Sharpener inside GIMP and then output sharpen using Nik after resizing. Works for me! Paul. > On 11-14-2017, at 8:55 AM, Šarūnas wrote: > > On 2017-11-13 20:34, Robert William Hutton wrot

Re: [darktable-user] Sharpening after resize

On 2017-11-13 20:34, Robert William Hutton wrote: > On 14/11/17 12:22, darkta...@911networks.com wrote: >> What are you doing/using for sharpening after export? My export sizes >> are around 900px jpegs for >> web with a quality of 70% for my 20Mpx and 24Mpx cameras. > > Isn't this what export sty

Re: [darktable-user] Sharpening after resize

On mardi 14 novembre 2017 08:21:13 CET Jean-Luc Coulon (f5ibh) wrote: > Hi, > If you want really to do something "after", then do it "outside". > You can do that in GIMP and you can even use the existing lua script to > call GIMP directly from dt. > > Jean-Luc Of course that's an option, but I'd

Re: [darktable-user] Sharpening after resize

Hi, If you want really to do something "after", then do it "outside". You can do that in GIMP and you can even use the existing lua script to call GIMP directly from dt. Jean-Luc 2017-11-14 8:03 GMT+01:00 : > On Mon, Nov 13, 2017, at 22:29, Lorenzo Bolzani wrote: > > I'm quite sure that all proc

Re: [darktable-user] Sharpening after resize

On Mon, Nov 13, 2017, at 22:29, Lorenzo Bolzani wrote: > I'm quite sure that all processing is applied before downscale (this has > been discussed before). And sharpening is mostly lost after downscale. This depends on whether "do high quality resampling during export" is checked in "core options

Re: [darktable-user] Sharpening after resize

I'm quite sure that all processing is applied before downscale (this has been discussed before). And sharpening is mostly lost after downscale. What I do is to reopen all the small exported files with DT, apply sharpening on the first one (with different parameters than before as the file is small

Re: [darktable-user] Sharpening after resize

* darkta...@911networks.com [11-14-17 00:30]: > On Mon, 13 Nov 2017 23:33:01 -0500 > Patrick Shanahan wrote: > > >don't you apply sharpening during you edit. you do realize that dt > >has a specific order that it applies the edits you prescribe on > >export. if you assigned sharpening during y

Re: [darktable-user] Sharpening after resize

On Mon, 13 Nov 2017 23:33:01 -0500 Patrick Shanahan wrote: >don't you apply sharpening during you edit. you do realize that dt >has a specific order that it applies the edits you prescribe on >export. if you assigned sharpening during your edit, it is applied >to the exports. -- Yes, I apply

Re: [darktable-user] Sharpening after resize

* darkta...@911networks.com [11-13-17 21:38]: > On Tue, 14 Nov 2017 12:34:28 +1100 > Robert William Hutton wrote: > > >On 14/11/17 12:22, darkta...@911networks.com wrote: > >> What are you doing/using for sharpening after export? My export > >> sizes are around 900px jpegs for web with a quality

Re: [darktable-user] Sharpening after resize

On Tue, 14 Nov 2017 12:34:28 +1100 Robert William Hutton wrote: >On 14/11/17 12:22, darkta...@911networks.com wrote: >> What are you doing/using for sharpening after export? My export >> sizes are around 900px jpegs for web with a quality of 70% for my >> 20Mpx and 24Mpx cameras. > >Isn't this

Re: [darktable-user] Sharpening after resize

On 14/11/17 12:22, darkta...@911networks.com wrote: What are you doing/using for sharpening after export? My export sizes are around 900px jpegs for web with a quality of 70% for my 20Mpx and 24Mpx cameras. Isn't this what export styles are for? https://www.darktable.org/usermanual/ch02s03s12

[darktable-user] Sharpening after resize

Hi, What are you doing/using for sharpening after export? My export sizes are around 900px jpegs for web with a quality of 70% for my 20Mpx and 24Mpx cameras. DT 2.2.5 on arch. -- sknahT vyS darktable user mailing lis

Re: [darktable-user] sharpening vs highpass

On Wed, Apr 26, 2017 at 10:23 PM, Lorenzo Bolzani wrote: > Al alternative is to use darktable-cli in this way: > > 1. export a downscaled version of the image > 2. open it with darktable and sharpen it to your liking (depending on the > downscaled size) > 3. close darktable and copy the xmp file a

Re: [darktable-user] sharpening vs highpass

Al alternative is to use darktable-cli in this way: 1. export a downscaled version of the image 2. open it with darktable and sharpen it to your liking (depending on the downscaled size) 3. close darktable and copy the xmp file as my-sharpen.xmp in a folder of choice 4. for your next downscaled ex

Re: [darktable-user] sharpening vs highpass

>>> BTW, is there a way of doing the sharpening after the resize in the >>> export Ctrl-E? >> >> AFAIK not. I use a custom shell script for downscaling+sharpening. > > Would you care to share? Not at all. The script(s) are appended. jpeg.downscale supports parallel processing of multiple files

Re: [darktable-user] sharpening vs highpass

On Mon, 24 Apr 2017 23:28:41 +0200 Markus Jung wrote: >> BTW, is there a way of doing the sharpening after the resize in the >> export Ctrl-E? > >AFAIK not. I use a custom shell script for downscaling+sharpening. Would you care to share? Thanks -- sknahT vyS ___

Re: [darktable-user] sharpening vs highpass

> * What the difference between the sharpening module and the highpass > with a softlight blend? Different Algorithms. Sharpening uses the unsharp mask technique, which emphasizes contrasts, highpass operates in the frequency domain (and i think it is possibly more selective and causes less arti

[darktable-user] sharpening vs highpass

DT 2.2.4 * What the difference between the sharpening module and the highpass with a softlight blend? * Should it be one or the other? * A combination? BTW, is there a way of doing the sharpening after the resize in the export Ctrl-E? -- sknahT vyS ___

Re: [Solved] Re: [darktable-user] Sharpening (round 2)

On Wed, 18 Jan 2017 16:40:39 -0800 "I. Ivanov" wrote: >It is good that it works for you (one way or another). I usually >export @95% and it seems to work well quality vs size. But perhaps >you have reasons to compress further I didn't try higher >compressions. Try webpages with: https://dev

Re: [Solved] Re: [darktable-user] Sharpening (round 2)

It is good that it works for you (one way or another). I usually export @95% and it seems to work well quality vs size. But perhaps you have reasons to compress further I didn't try higher compressions. Regards, B On 2017-01-18 02:36 PM, darkta...@911networks.com wrote: On Wed, 18 Jan 2

[Solved] Re: [darktable-user] Sharpening (round 2)

On Wed, 18 Jan 2017 13:19:35 -0800 "I. Ivanov" wrote: >No I didn't... but the images were @100%. I just wanted to point out >that the viewer can influence the perception. Based on what I have >seen I believe DT is working as expected. The way how the other >viewers render the image however can va

Re: [darktable-user] Sharpening (round 2)

No I didn't... but the images were @100%. I just wanted to point out that the viewer can influence the perception. Based on what I have seen I believe DT is working as expected. The way how the other viewers render the image however can vary significantly. But it is not really a DT issue. Never

Re: [darktable-user] Sharpening (round 2)

I think part of the effect (in addition to what the others have found out) is the viewer that you are using. This is in Geeqie - color matched exported at 900 dpi and seen @ 100% https://www.dropbox.com/s/ek5e3me3haq3dn2/Screenshot%20from%202017-01-17%2020-33-12.png?dl=0 This is Geeqie - color

Re: [darktable-user] Sharpening (round 2)

On Mon, 16 Jan 2017 21:21:54 -0800 "I. Ivanov" wrote: >You may want to provide a raw file and xmp so we can test. https://drive.google.com/file/d/0B7HTmJCO2gG7WDl1NUVxbVQ3aGs/view?usp=sharing -- sknahT vyS darktable

Re: [darktable-user] Sharpening (round 2)

On Tue, 17 Jan 2017 07:23:54 +0100 Remco Viëtor wrote: >But what do you do exactly in that extra style you apply on export? Only frame and watermark >And what's the exact command you use to mogrify your images? it was: mogrify -quality "85%" -resize 900x900 but I did some further test. I foun

Re: [darktable-user] Sharpening (round 2)

Am Dienstag, 17. Januar 2017, 08:16:46 CET schrieb Matthieu Moy: [...] > You're viewing your images at a zoom level different from 100%, so you're > not only benchmarking your rescaling tool (dt Vs mogrify), but also your > image viewer's rescaling. > > Don't do that. If you want to compare the

Re: [darktable-user] Sharpening (round 2)

- Original Message - > From: darkta...@911networks.com > To: darktable-user@lists.darktable.org > Sent: Tuesday, January 17, 2017 3:35:51 AM > Subject: [darktable-user] Sharpening (round 2) > Hi, > > DT 2.2.1 on arch > > I'm still having problems with th

Re: [darktable-user] Sharpening (round 2)

On lundi 16 janvier 2017 18:35:51 CET darkta...@911networks.com wrote: > Hi, > > DT 2.2.1 on arch > > I'm still having problems with the export: 900x900. > > Here are my settings: http://i.imgur.com/QS74VlT.png > But what do you do exactly in that extra style you apply on export? And what's the

Re: [darktable-user] Sharpening (round 2)

You may want to provide a raw file and xmp so we can test. I can't see a huge difference on my images. There may be but the resolution is rather small - 900dpi. In the core options there is "high quality re sampling during export". This option would interfere however with "dithering" (if I un

Re: [darktable-user] Sharpening (round 2)

On Mon, 16 Jan 2017 22:54:15 -0500 Patrick Shanahan wrote: >youtube darktable tutorial sharpening I didn't googled, I youtubed (if that can be converted to a verb) and only found: https://www.youtube.com/watch?v=IhMR88Jt6nk Using Drawn Masks in Darktable to Sharpen Select Areas. - YouTube. I ha

Re: [darktable-user] Sharpening (round 2)

* darkta...@911networks.com [01-16-17 21:37]: > Hi, > > DT 2.2.1 on arch > > I'm still having problems with the export: 900x900. > > Here are my settings: http://i.imgur.com/QS74VlT.png > > Here is a comparison: http://i.imgur.com/BzbRfbs.png > > * left: full, no resizing > * middle: resized

[darktable-user] Sharpening (round 2)

Hi, DT 2.2.1 on arch I'm still having problems with the export: 900x900. Here are my settings: http://i.imgur.com/QS74VlT.png Here is a comparison: http://i.imgur.com/BzbRfbs.png * left: full, no resizing * middle: resized to 900x900 at export (the settings: http://i.imgur.com/QS74VlT.png) a