larsbre Posted March 18, 2020 Posted March 18, 2020 To increase the local contrast of an image, I apply the following approach in the photo persona: 1. Duplicate the layer 2. Set the blend mode of the upper layer to "vivid light" and the opacity to 20% - 30% 3. Apply "high pass" live filter to the upper layer with radius 100 px and monochrom checked This was working fine for both jpeg files and raw files coming from the develop persona for all versions before 1.8.2. For version 1.8.2 however, this leads to strange artefacts when using raw files from develop persona: Jpeg RAW I also tried a workaround by using only one layer (no duplicate) and applying the "high pass" directly to the lower layer using "vivid light" as blend mode for the "high pass" with the other settings (radius, opacity) as above. This works fine for the jpeg file but same unsatisfying result for the raw file. I have tested this for numerous jpeg-raw combinations and you can find 3 pairs attached. Images.rar Quote
Ron P. Posted March 19, 2020 Posted March 19, 2020 @larsbre, I'm not sure what effect you're wanting to achieve, but most of the time when applying a high-pass filter, people generally use softlight or overlay blend modes. Vivid light produces bizarre results as you have found. Quote Affinity Photo 2.5..; Affinity Designer 2.5..; Affinity Publisher 2.5..; Affinity2 Beta versions. Affinity Photo,Designer 1.10.6.1605 Win10 Home Version:21H2, Build: 19044.1766: Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz, 3301 Mhz, 6 Core(s), 12 Logical Processor(s);32GB Ram, Nvidia GTX 3070, 3-Internal HDD (1 Crucial MX5000 1TB, 1-Crucial MX5000 500GB, 1-WD 1 TB), 4 External HDD
larsbre Posted March 19, 2020 Author Posted March 19, 2020 1 hour ago, Ron P. said: @larsbre, I'm not sure what effect you're wanting to achieve, but most of the time when applying a high-pass filter, people generally use softlight or overlay blend modes. Vivid light produces bizarre results as you have found. Yeah, I know the other techniques for "high pass". Nevertheless, this was working properly in Affinity Photo without artefacts before, it is working properly in other software like GIMP or Darktable and is still working properly for jpeg files in Photo 1.8.2. Even if these "bizarre results", as you call it, are desired by Serif (I have high doubts that this is the case...), there should be the same artefacts for jpeg files directly in photo persona and raw files coming from develop persona.... Quote
Greyfox Posted March 19, 2020 Posted March 19, 2020 @larsbre For what it is worth, that problem doesn't occur if after development of the raw image, you change it to RGBA/8 instead of RGBA/16 Ron P. 1 Quote Intel i7-10700 Gen10 CPU, 32GB RAM, Geforce GTX 1660 OC 6GB Windows 10 Pro 22H2, 1x 1TB M.2 NVMe, 1 x 2TB M.2 NVMe. Affinity APh, APu, ADe
larsbre Posted March 19, 2020 Author Posted March 19, 2020 Thanks for your response, this gives a workaround for the moment. This concret example may be a rare special case that does not seem to be very relevant to many but in general: shouldn't the effect of a blend mode be independent from color depth? (And as far as I can tell, it did not matter up to now, at least I didn't experience this before version 1.8.2). So there might be a general issue in the code for blend modes that can have also other effects. Not sure, just a suggestion to have a closer look at.... Quote
Chip J. Posted March 20, 2020 Posted March 20, 2020 I'm experiencing same issue with 1.8.2. I'm using the Extract Detail Macro that Pedro Soares created here: https://forum.affinity.serif.com/index.php?/topic/36265-extract-detail-macro/&tab=comments#comment-178831 It too uses Vivid Light filter. Works fine on Jpegs, but creates colored artifacts on raw (NEF) files. Problem disappears when I convert to RGB/8 bit. nschall 1 Quote
nschall Posted March 21, 2020 Posted March 21, 2020 Have the same effect as described by Mesquito Quote
Staff Gabe Posted March 30, 2020 Staff Posted March 30, 2020 Hi all, We are aware of this and it has already been logged with our developers. larsbre 1 Quote
larsbre Posted May 9, 2020 Author Posted May 9, 2020 On 3/30/2020 at 1:25 PM, Gabe said: Hi all, We are aware of this and it has already been logged with our developers. Thanks Gabe for your effort. Any news regarding this? Quote
Chip J. Posted August 18, 2020 Posted August 18, 2020 Checking in to see if this issue is still on the radar to be fixed? Quote
NotMyFault Posted February 10, 2022 Posted February 10, 2022 Bump. It seems this bug never got fixed in up to 1.10.4, despite it having been archived. Quote Mac mini M1 A2348 | Windows 10 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 iPad Air Gen 5 (2022) A2589 Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps. My posts focus on technical aspects and leave out most of social grease like „maybe“, „in my opinion“, „I might be wrong“ etc. just add copy/paste all these softeners from this signature to make reading more comfortable for you. Otherwise I’m a fine person which respects you and everyone and wants to be respected.
Chip J. Posted February 11, 2022 Posted February 11, 2022 This is still a bug. If you use 'Vivid Light' on a 16 bit image, you get all kinds of artifacts. Quote
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