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LenC

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About LenC

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  1. The burn tool works on a separate pixel layer as expected. It also sort of works if I select both the fill layer and the pixel layer underneath, with the burning happening visibly in the combined image -- but Ritson's video shows the gray layer changing lightness. Mine does not. This may or not be pertinent. I could not get Ritson's sequence 'create fill layer and then fill it with 50% gray' to work. Instead I chose 50% gray in the color panel and then created the fill layer from the menu, whereupon the new layer contained the desired gray. The color panel single circle was gray but could be adjusted to B/W without apparently affecting the burn brush behavior. Changing Tonal Range from Shadows to Midtones did not have any perceptible effect.
  2. I'm trying to follow Ritson's video below. Surely some trivial setting is wrong. When I paint on the 50% gray layer with the burn brush, nothing changes, even at 100% opacity. When he paints, you can see the gray layer getting lighter in places. I'm attaching a full screen shot. . Surely some trivial setting is wrong.
  3. Presumably you have created a basic white mask. Depending on what you want to do, you may want to make some black selections on it. If your question is more specific and contains some more details and is posted on the main forum page, you will get better help. I would go over the selecting and masking video tutorials Also look up masks in the online help https://affinity.help/photo/en-US.lproj/index.html If you are looking for a text introduction, there is a new inexpensive one by Robin Whalley that you can find through Google.
  4. LenC

    >|<, based on your demonstrated understanding of layer work and comments on issues with AP's current implementation, do you have any suggestions for learning more about this? Margulis is stimulating but hard to apply to AP. Photoshop Channel Chops does not do much for me. Or is it just that practice is the only way to Carnegie Hall?

    1. >|<

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      Hi Len, I can only suggest experimentation and practice. AP needs a complete overhaul of its channels functionality, and the Apply Image filter could be improved, but you should be able to find workarounds that will accomplish many of the Margulis techniques. Good luck.

  5. Thank you for pointing out this video at Dave Straker's InAffinity YouTube channel, previously unknown to me, which has a large number of videos that I intend to explore. As he demonstrates, the menu Select .. Colour Range .. operation selects less than the full individual color channel. Thus selecting R, G, and B "ranges" individually and adding them does not give a full RGB image. The nature of the algorithm or result is not discussed in the online help topic Selecting Colours, which discusses app user choices more than app developer ones. The related Select .. Select Sampled Colour comes with tolerance and colour model options, showing that this operation is not as precisely defined as the channel masking one. In terms of practical image operations, I repeated the sky darkening operation I use with both a blue channel mask and with the select blues mask and found the results much more comparable than in my initial experiment that led me to the original post. No further help needed for now.
  6. Thanks, I should have thought to try that. Perhaps the busy @James Ritson could say a little about my first question.
  7. Or point me to some text or video. I understand and can make use of the Channels to Mask Layers macro, and I would think the Colour Ranges to Masks would do the same thing, which it doesn’t. Can someone explain the steps used in the macro and what the resulting mask is useful for? For that matter, is it possible to display the steps of a macro other than when creating one?
  8. Thanks to both. Just a little more: how do you create that link to a particular member like @GabrielM?
  9. Thanks, I guess my puzzlement is just because I never saw this before, and it does begin to make sense. I have created masks as part of adjustment layers for a couple of years and never (IIRC) saw this checkerboard before. I get it that a mask and an alpha channel are two aspects of one type of algorithm, but not sure when the different names apply. The mask above the layer shows the checkerboard plus what's visible in the layer below, but nested with the layer it shows no checkerboard, or just the blue layer if I click the thumbnail. But the Channels panel has added a Mask Alpha channel. I will have to check if other masks have a Mask Alpha channel. The bug question was separate. I thought that all JPEGs do not have an alpha channel by their 3-byte design ; is this right? But the Channels Panel has a layer (empty) labeled Background Alpha. This would make sense to me if importing a file with an alpha layer, but not if it does not exist. I will be exploring the issues with channel behavior and UI in AP that others have pointed out in these forums.
  10. That's right. Also checked it in the Terminal since there was another Applications folder, but it is empty. (Will not be responding tonight if you have other thoughts, must sign off.)
  11. I have had the same problem since the beginning, unable to launch the beta, even though both apps are in Applications off root as far as I can tell. But I guess this is too rare to inspire a search for a solution.
  12. I'm trying to learn about using channels for blending or masking to darken a sky. I selected my background layer and executed Background Blue channel: Create mask layer. The new mask layer appears as in the attached file, with a checkerboard all over the image. The blue channel is supposed to be 256 shades of gray, not an alpha channel. (My document menu has Transparent Background checked, presumably a default, as I don't know what this means.) In any case, if I nest the mask in the background layer it appears as the blue channel and does what it is supposed to do, permitting me to blend-Multiply-darken the sky without darkening the foreground. Can someone clarify what is going on or where I can read more about this? Also after importing a JPEG, the Channels panel always shows a Background alpha channel, which can't be there (I think). Bug, or feature of which I am ignorant?
  13. Could we get a post pinned to the top of this thread or otherwise visible that tells where the latest version of the roadmap is to be found, or even contains it?
  14. The "master" histogram shown in the current version is the intersection of all the channels. The current beta has improved this, though IMO there's more to do. Why don't you look at it and offer comments in the beta forum.
  15. While so many people are following this, let me ask: what is the practical use of Input Minimum and Maximum? A variation on Black Point and White Point? The Affinity help says it's for out-of-gamut 32-bit work but could be used in other color spaces. But it seems to somehow create a problem with LAB A and B (-128 to 127 or -1 to 1) in equations, which have to be offset to function properly. And 0-100 rather than 0-1 is used much more elsewhere in AP.
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