M_alvarez Posted May 6, 2018 Share Posted May 6, 2018 I have a very large image 5000px x 3500px and I need to make it 870px x 320px for a website banner. I know I have to crop the image first because the ratios are not the same, but I have tried many ways, even tried to edit the SVG code, and it's just impossible. The image doesn't look sharp enough. Is this impossible to do? am I wasting my time? or is someone actually able to resize this much a very large image and keep at least moderate quality? Thanks! Quote Link to comment Share on other sites More sharing options...
R C-R Posted May 6, 2018 Share Posted May 6, 2018 5 hours ago, M_alvarez said: Is this impossible to do? Short answer: yes, it is impossible. Longer answer: ignoring cropping, you are trying to reduce 17.5 million pixels to around 278 thousand pixels, which means every 63 or so pixels of the original has to be replaced with 1 pixel in the smaller version. That does not allow for much detail retention, so unless there are not many fine-scale details in the original, the smaller version is going to look terrible. Quote All 3 1.10.8, & all 3 V2.4.0 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7 Affinity Photo 1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7 Link to comment Share on other sites More sharing options...
Alfred Posted May 6, 2018 Share Posted May 6, 2018 7 hours ago, M_alvarez said: The image doesn't look sharp enough. Please forgive me if I’m asking the obvious, but have you tried sharpening it? Getting a usable result is generally much easier when shrinking an image than when enlarging one, since you only have to discard existing pixels instead of creating new ones. Quote Alfred Affinity Designer/Photo/Publisher 2 for Windows • Windows 10 Home/Pro Affinity Designer/Photo/Publisher 2 for iPad • iPadOS 17.4 (iPad 7th gen) Link to comment Share on other sites More sharing options...
R C-R Posted May 6, 2018 Share Posted May 6, 2018 8 minutes ago, Alfred said: Please forgive me if I’m asking the obvious, but have you tried sharpening it? For such extreme size reductions, the best approach is likely to be simplifying the image first as much as possible, like by painting out fine details or using noise reduction selectively, or whatever else works best to preserve important large scale details & eliminate fine scale ones. Quote All 3 1.10.8, & all 3 V2.4.0 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7 Affinity Photo 1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7 Link to comment Share on other sites More sharing options...
Alfred Posted May 6, 2018 Share Posted May 6, 2018 2 minutes ago, R C-R said: For such extreme size reductions, the best approach is likely to be simplifying the image first as much as possible, like by painting out fine details or using noise reduction selectively, or whatever else works best to preserve important large scale details & eliminate fine scale ones. In general, yes. If we could see the actual image we might be able to offer more specific advice. R C-R 1 Quote Alfred Affinity Designer/Photo/Publisher 2 for Windows • Windows 10 Home/Pro Affinity Designer/Photo/Publisher 2 for iPad • iPadOS 17.4 (iPad 7th gen) Link to comment Share on other sites More sharing options...
M_alvarez Posted May 6, 2018 Author Share Posted May 6, 2018 First of all, thank you guys for your replies. @R C-R I thought this was impossible as well, I had my hopes up. @alfred absolutely! I attached 2 images - I couldn't upload the original, maybe because it's really big. The original, cropped, and my attempt to resize it to 870px x 320px. Thanks again! Quote Link to comment Share on other sites More sharing options...
MikeW Posted May 6, 2018 Share Posted May 6, 2018 11 hours ago, M_alvarez said: I have a very large image 5000px x 3500px and I need to make it 870px x 320px for a website banner. I know I have to crop the image first because the ratios are not the same, but I have tried many ways, even tried to edit the SVG code, and it's just impossible. The image doesn't look sharp enough. Is this impossible to do? am I wasting my time? or is someone actually able to resize this much a very large image and keep at least moderate quality? Thanks! Try using Unsharp mask or even sharpening before cropping/resizing. You'll need to experiment once or twice, but use an amount that looks over sharpened. What you will likely need is enough of a value to overcome the size of the image and look, well, sort of bad. Then crop and resize. It will get softer when the resize happens. And you will need to experiment whether bicubic or Lanzcos works better fr you. The below was a first attempt. firstdefence 1 Quote Link to comment Share on other sites More sharing options...
Alfred Posted May 6, 2018 Share Posted May 6, 2018 2 hours ago, MikeW said: And you will need to experiment whether bicubic or Lanczos works better for you. Lanczos usually works better when resizing upwards, and bicubic (or even bilateral) usually works better when resizing downwards, but the rules may be different if you’ve sharpened the image beforehand. Quote Alfred Affinity Designer/Photo/Publisher 2 for Windows • Windows 10 Home/Pro Affinity Designer/Photo/Publisher 2 for iPad • iPadOS 17.4 (iPad 7th gen) Link to comment Share on other sites More sharing options...
EZeemering Posted May 7, 2018 Share Posted May 7, 2018 13 hours ago, Alfred said: Lanczos usually works better when resizing upwards, and bicubic (or even bilateral) usually works better when resizing downwards, but the rules may be different if you’ve sharpened the image beforehand. Hmm I find that lanczos works better for downsizing. I haven't touched bicubic in the last couple of builds tho. Quote Link to comment Share on other sites More sharing options...
HVDB Photography Posted May 7, 2018 Share Posted May 7, 2018 Using a Live Unsharp Mask filter firstdefence and Alfred 2 Quote Affinity Photo 2.3.1 Laptop MSI Prestige PS42 Windows 11 Home 23H2 (Build 22631.3007) - Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz 2.00 GHz - RAM 16,0 GB Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.