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Found 18 results

  1. In the Channel Mixer, you can select a single channel by choosing a colour model and zeroing the unwanted channels. eg. for red channel, use RGB model, select to Greens and zero Green, then select Blues and zero Blue. I can do this for RGB and CMYK. But in LAB, if I zero AOpponent and BOpponent I'm getting a blue/cyan result. What am I doing wrong? Should it not be b/w? ps. I can separate channels by changing document colour model and clearing in the Channels panel, but I'd just like to be able to do it in Channel Mixer.
  2. Hi, I write few pages about L*a*b* worflow for trying promote this space about decoupling Color & Lightness in L*a*b* here Lab.pdf this macros is on 1.7 version , not compatible with 1.6 Lab.afmacros Just read this answer Nothing new reinvent the wheel... But perhaps, some one, may have better understanding of this color space and more easy color apprehension, more easy color manipulation Sorry for my bad english, not my maternel language Have fun
  3. when developing HDR images there is the danger that with RGB color mode you get color faults, because RGB represents color and luminance in the same value. If Affinity Photo would enable a LAB 32 bit HDR color mode that would solve the problem. Because color and luminance are now separated, the large dynamic range of HDR images are mainly reflected in luminance. This prevents color faults during HDR generation. By the way, I like the way Affinity Photo is adressing HDR development in the workflow. However, because I quite regularly get color faults during development, I can not use it in many situations (see attached image as an example for such a color fault in the sky). In this case I use my LAB 32 bit based HDR development programm (Oloneo), which produces nicer color without color faults.
  4. I don't know if this has been suggested but I use curves a fair bit and particularly LAB for those really powerful wide gamut adjustments. The current graph only has a four by four grid which isn't anywhere near enough to lock in really fine changes. It would be really handy if it were possible to size these graphs too. It's something I'm used to in other software so I was expecting to see it here and (I assume) that changing the reticule is a five minute job for an intern. Resizing is a different matter because that carries other problems … but pretty, please with knobs and bells on (and a cherry on top)?
  5. I would be nice to have lab colours in the colour chooser as per attached. Kind Regards
  6. shojtsy

    LAB macros

    Hi, Here is a library of macros of various LAB operations. It can do - Selective desaturation of LAB channels - Separate LAB channels to greyscale layers without switching to LAB mode - Join back LAB greyscale layers to a composite image without switching to LAB mode - LAB color contrast boost Enjoy! As for the file size being 4MB for a few macros, I have no idea, it is probably a bug. SH LAB tools.afmacros
  7. Hi, When using Curves Adjustment layer and selecting LAB color space for the curves adjustment for an image in RGB space, the histogram shown behind the curve is incorrect. It still shows the RGB channel histograms behind, such that Lightness curve has the Red channel histogram, AOpponent has the Green channel histogram, and BOpponent has the Blue channel histogram. This is very misleading and even worse than not having a histogram. The same happens for CMYK curves.
  8. Calculation of the following blend modes is broken when LAB/16 color space is used in AF 1.6.1.93: -Colour Dodge -Difference -Exclusion -Subtract -Average -Negation -Reflect -Glow -Hard Mix Other blend modes work correctly, so I don't assume it would be any problem with using LAB and blend modes. All of these except Hard Mix behave as if Normal mode would be used. Hard Mix in LAB produces some extreme Red coloration even with grayscale inputs. Reflect blend mode broken in LAB.afphoto
  9. In Blend Options for an image in RGB, I can only choose Master, Red, Green and Blue to control blending. However in Curves I can work with LAB channels even if the main colorspace is not LAB. It would be very good to be able to choose LAB channels in Blend Options the same way. Color channels of LAB are fantastic to isolate an effect or adjustment to certain objects / areas of the image in a dynamic non-destructive way that masks can't reproduce.
  10. So, I recently started working in LAB space. My question is, if I am working in an individual channel say Lightness(only channel editable), how do I ensure that all filters and adjustments are applied before jumping to RGB? Because, on changing to RGB it highlights R channel only , so I am not sure how to preserve my LAB work..
  11. Dan Margulis says that HSL adjustments are much easier to do LAB color. You already let us do Curves in LAB color space. How about HSL? Thanks!
  12. what are the limitations with using LAB colors in AP and printing? thank you ! what is the correct LAB WORFLOW FOR PRINTING ?
  13. I miss the ability to numerically edit the coordinates of control points on curves (adjustment layers). In PS, the input/output values of a control point are displayed and can be entered numerically, or - even better - precisely adjusted with the scroll wheel. Especially when working in LAB for detailed color correction, this precision is a must, as manipulations of the a/b-curves allow for great control of subtle color shifts but also wreck havoc on a picture if only slightly misadjusted.
  14. The preference panel of Affinity Designer shows only "D50" as an option for Lab colors. But comparing the sRGB comparison values to other tools (chromatist.js and Color Machine for Mac) the values I got are more comparable to the ones of a "D65" color profile (not exactly though). Hex: #0b798f LAB from Affinity (D50): 46, -23, -20 LAB from Chomatist (D65): 47,-20,-20 LAB from Chomatist (D50): 47,-21,-32 Hex: #872157 LAB from Affinity (D50): 32, 47, -6 LAB from Chomatist (D65): 32, 47, -7 LAB from Chomatist (D50): 32, 46, -16 Maybe someone can clarify this and/or figure out whether this is just an issue in Affinity. Thanks!
  15. Hi, there's a Plugin for PS (Windows only) called Curvemeister which allows to Curve in different colorspaces. E.g. the document is RGB, the Curves dialog shows the usual RGB Composite + R, G, B channels and L, a, b, and C, M, Y, K (which channels are calculated on the fly). In PrePress it's quite usual to switch carelessly from one colorspace to another to exploit each colorspace peculiar features. The multi-colorspace Curving could be implemented, say, only when the document is converted to Lab (so that you're already in a device-independend space, which saves you a conversion). Thank you, Davide Barranca
  16. David

    Creature Buffet

    Words can not describe how happy I'm with how masks work in Affinity
  17. The attached 3 screenshot show 3 Affinity color modes CMYK (8 bit) RGB (8 bit) LAB/16 They defenitely do vary too extreme. The background vector rectangle has a neutral grey fill (cmyk 20/20/20/100) and a black/white level adjustment applied. The applications rendering intent is set to "Relative colorimetric" + "Black point compensation" active.
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