Nelly Posted October 24, 2019 Share Posted October 24, 2019 Just struggling to get a perfectly smooth gradient upon export as PDF. This is for a leaflet I am getting printed professionally. Smooth in edit and if saved as a JPEG. But causes 'lines' down the page as a PDF. Colour Format: CMYK/8 Colour Profile: Coated FOGRA39 (although Web Coated SWOP v2 and Generic give similar results) PDF settings attached along with samples of the issue. Urgent help much appreciated! Quote Link to comment Share on other sites More sharing options...
lacerto Posted October 24, 2019 Share Posted October 24, 2019 (...) Quote Link to comment Share on other sites More sharing options...
Nelly Posted October 26, 2019 Author Share Posted October 26, 2019 Hi Lagarto Ok, so I exported your gradients.afpub as a PDF with the settings as attached and here is the result, still get a 'banding' effect. Appreciate your help on this... gradients - user nelly.pdf Quote Link to comment Share on other sites More sharing options...
thomaso Posted October 27, 2019 Share Posted October 27, 2019 20 hours ago, Nelly said: Ok, so I exported your gradients.afpub as a PDF You have selected "Rasterise: Everything" for your export. That forced the gradient to get converted for the PDF into a CMYK pixel image in its specific resolution (ca. 1500 x 3800 px). To export the gradient as smooth vector data avoid its rasterisation. Quote macOS 10.14.6 | MacBookPro Retina 15" | Eizo 27" | Affinity V1 Link to comment Share on other sites More sharing options...
lacerto Posted October 27, 2019 Share Posted October 27, 2019 (...) Quote Link to comment Share on other sites More sharing options...
lacerto Posted October 27, 2019 Share Posted October 27, 2019 (...) Quote Link to comment Share on other sites More sharing options...
Nelly Posted October 30, 2019 Author Share Posted October 30, 2019 Ok so: When you view the gradient.pdf that I had produced, did you see banding there, as well? No, it was smooth (For what its worth I have a 2018 iMac with a 5k screen) For PDFs I just use Apple's standard preview program Will try the non-rasterisation idea, but I believe I started with that and was corned that then my gradient would not be in CMYK, which it needs to be, as it is to be printed... Quote Link to comment Share on other sites More sharing options...
Nelly Posted October 30, 2019 Author Share Posted October 30, 2019 In fact, if I don't rasterise the gradient doesn't show at all... Quote Link to comment Share on other sites More sharing options...
Nelly Posted October 30, 2019 Author Share Posted October 30, 2019 Just downloaded acrobat, banding just as bad... Quote Link to comment Share on other sites More sharing options...
thomaso Posted October 30, 2019 Share Posted October 30, 2019 2 hours ago, Nelly said: In fact, if I don't rasterise the gradient doesn't show at all... Can you upload this PDF please? Do you see the same (not-) appearance in both your viewer apps Preview and Acrobat? In case you don't test with Lagarto's "gradients.afpub" : What kind of object is your gradient? How did you originally create or place it and in which Affinity app? In your first post above I do see just two very dark gray rectangles but with text mentioning gradients. – Do you see gradients in these screenshots in your post? Edit: sorry, I do see the gradients, I just wasn't expecting them so dark (had set my browsers monitor to reduced brightness) Quote macOS 10.14.6 | MacBookPro Retina 15" | Eizo 27" | Affinity V1 Link to comment Share on other sites More sharing options...
lacerto Posted October 30, 2019 Share Posted October 30, 2019 (...) Quote Link to comment Share on other sites More sharing options...
thomaso Posted October 31, 2019 Share Posted October 31, 2019 Lagarto, I guess the banding is too little to become obvious in the small + lowres histogram. Here is a part of the screenshot of Nelly's first post enlarged to 300%. The banding appears visible to me, and it becomes more obvious if I look at the screenshot in a more narrow angle (e.g. from top onto the macbook screen) Another way to make the banding more obvious is to move the right (lights) slider in your histogram far to the left. – It will look somehow like this: You also can move - additionally, not instead - the dark and mid slider to make the banding more visible. I wonder whether any transparency was involved when @Nelly did create this gradient. Quote macOS 10.14.6 | MacBookPro Retina 15" | Eizo 27" | Affinity V1 Link to comment Share on other sites More sharing options...
lacerto Posted October 31, 2019 Share Posted October 31, 2019 (...) Quote Link to comment Share on other sites More sharing options...
lacerto Posted October 31, 2019 Share Posted October 31, 2019 (...) Quote Link to comment Share on other sites More sharing options...
thomaso Posted October 31, 2019 Share Posted October 31, 2019 3 hours ago, Lagarto said: what I am wondering is that why JPG does NOT show banding while the PDF does. I cannot see any remarkable difference between the two screenshots. Lagarto, I do see an obvious difference between Nelly's jpg and pdf. The JPG looks noisy, possibly created by compression. That could prevent the banding to become same visible than in the PDF. A jpg must be rasterized, a pdf not necessarily, so I am not surprised about a difference between them. As long we don't have anything else from Nelly than this two screenshots I don't think much about it because of too many possibilities. Nelly's screenhost in zoom view: top: JPG / below: PDF Quote macOS 10.14.6 | MacBookPro Retina 15" | Eizo 27" | Affinity V1 Link to comment Share on other sites More sharing options...
Nelly Posted October 31, 2019 Author Share Posted October 31, 2019 Hi all Going to try answer these questions best I can... Quote Link to comment Share on other sites More sharing options...
lacerto Posted October 31, 2019 Share Posted October 31, 2019 (...) Quote Link to comment Share on other sites More sharing options...
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