Tom Schülke Posted January 28, 2019 Share Posted January 28, 2019 Hi everyone... Somehow i didnt knowtice this any time befor... What ist htis for ? I Select an image with a curve as mask... and when i use the move tool, i get a button called: " K only"... what is this for ? Quote Link to comment Share on other sites More sharing options...
walt.farrell Posted January 28, 2019 Share Posted January 28, 2019 The Affinity applications have previously had problems exporting CMYK files as PDF, where blacks would not just be shades of K but would be mixtures of CMY. Publisher beta .227 added support for K only blacks in CMYK files, and "K Only" on the Context Menubar probably indicates that only black will be used for that image. From the Release Notes for .227: Quote Export PDF Export now exports greyscale images as K-only Added feature to recolour any image as K-only, and spot recoloured K-only images now export to PDF correctly Quote -- Walt Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases PC: Desktop: Windows 11 Pro, version 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 Laptop: Windows 11 Pro, version 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU. iPad: iPad Pro M1, 12.9": iPadOS 17.4.1, Apple Pencil 2, Magic Keyboard Mac: 2023 M2 MacBook Air 15", 16GB memory, macOS Sonoma 14.4.1 Link to comment Share on other sites More sharing options...
Tom Schülke Posted January 28, 2019 Author Share Posted January 28, 2019 Thanks Walt... Quote Link to comment Share on other sites More sharing options...
walt.farrell Posted January 28, 2019 Share Posted January 28, 2019 You're welcome, Tom. Mind you, that's a bit of a guess, and there are still some aspects that I don't understand. For example, if I click on the picture (not the frame) in the Layers panel, I see "K Only" on the Move Tool's Context menu. If I click the Fill well, and switch to CMYK Sliders, I can move the C/M/Y sliders and it affects the picture. If the picture is using K Only, I don't know why adjusting the Fill using those sliders has an effect, or what that effect really is. The Context menu still says K Only when I'm done, even though the Fill well may show a color. Quote -- Walt Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases PC: Desktop: Windows 11 Pro, version 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 Laptop: Windows 11 Pro, version 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU. iPad: iPad Pro M1, 12.9": iPadOS 17.4.1, Apple Pencil 2, Magic Keyboard Mac: 2023 M2 MacBook Air 15", 16GB memory, macOS Sonoma 14.4.1 Link to comment Share on other sites More sharing options...
fde101 Posted January 28, 2019 Share Posted January 28, 2019 Best guess is that they are doing the same thing as if the checkbox were off, then the image is being converted to gray after that stage of processing with the resulting gray value being applied directly to the K channel. walt.farrell 1 Quote Link to comment Share on other sites More sharing options...
Dave Harris Posted January 30, 2019 Share Posted January 30, 2019 If you apply a colour to a bitmap image, it recolours the bitmap. If K-Only is off, then we use an HSL algorithm to recolour that preserves black. It has always worked for RGB8 documents but wasn't implemented for other colour models. It now works for every colour model, including CMYK. If K-Only is on, then we use a different algorithm to recolour which produces tints of the colour you apply. This doesn't look as good visually, but if the colour is a Spot, it can be exported to PDF on a single colour plate. This is important for some people. If you toggle K-Only on and off, you should see the difference: without K-Only, 100% black parts of the image remain 100% black, and with it they become 100% tint of the colour you applied. You can also recolour to a gradient. The visual effect with/without K-Only is what you'd expect given the above, but currently it will convert to process colours during PDF export. Mgn, musiberti, Fixx and 2 others 4 1 Quote Link to comment Share on other sites More sharing options...
David Oliver Posted October 22, 2021 Share Posted October 22, 2021 On 1/30/2019 at 10:25 AM, Dave Harris said: [...] if the colour is a Spot, it can be exported to PDF on a single colour plate. This is important for some people. If you toggle K-Only on and off, you should see the difference: without K-Only, 100% black parts of the image remain 100% black, and with it they become 100% tint of the colour you applied. Sorry for resurrecting such an old thread, but I just wanted to say that it's great Designer can recolour bitmap and greyscale raster images with spot colours. This was one of the things I had in mind to check before moving away from Adobe as I sometimes produce stationery with spot colours. My first attempt was using a colour overlay filter, but then I found the K only button. I used to use Serif software back in my teenage days, and it looks like I'm about to come back as Designer seems just fine so far, and better in Illustrator with regard to text styles. Quote Link to comment Share on other sites More sharing options...
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