Gevaubr Posted March 15, 2021 Share Posted March 15, 2021 Hi, I have a series of old photocopies with text and b/w-images. They should be reproduced as facsimile. As you could imagine photocopied images are a nightmare considering the quality. Does anyone have an idea how to improve the quality of the b/w-images? My first idea is: 1. scan the images with 600dpi 2. unsharpen the image 3. reduce them to 300dpi 4. sharpen the result. This brings a little improvement. Any suggestions for a more convincing procedure? Thanks, Georg 600dpi_Original.tif Quote Link to comment Share on other sites More sharing options...
NotMyFault Posted March 15, 2021 Share Posted March 15, 2021 Hi Georg, if you are searching for the name in the bottom of the image, you can find a high-res colored postcard in better quality of the same building. This might save some time Cheers, Timo Quote Mac mini M1 A2348 | Windows 10 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 iPad Air Gen 5 (2022) A2589 Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps. My posts focus on technical aspects and leave out most of social grease like „maybe“, „in my opinion“, „I might be wrong“ etc. just add copy/paste all these softeners from this signature to make reading more comfortable for you. Otherwise I’m a fine person which respects you and everyone and wants to be respected. Link to comment Share on other sites More sharing options...
Gevaubr Posted March 15, 2021 Author Share Posted March 15, 2021 Thanks Timo! In this specific case it helps. But there are about 70 other images. Photopgraphy, postcards, drawings... so I'm still searching for a procedure... Regards, Georg Quote Link to comment Share on other sites More sharing options...
NotMyFault Posted March 17, 2021 Share Posted March 17, 2021 Hi Georg, it seems there is no silver bullet. Similar to lossy compression, some information has been lost when images were rasterized / dithered from grayscale to pure black & white raster. You original seems to be distorted compared to the other image. You workflow seems quite reasonable to me. You may try different workflow, e.g. using frequency separation reduce resultion more drastically (4x or 8x) and then use other AI-supported upscale apps (not available in Affinity Photo) to re-gain some details. Have luck and fun, Timo Quote Mac mini M1 A2348 | Windows 10 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 iPad Air Gen 5 (2022) A2589 Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps. My posts focus on technical aspects and leave out most of social grease like „maybe“, „in my opinion“, „I might be wrong“ etc. just add copy/paste all these softeners from this signature to make reading more comfortable for you. Otherwise I’m a fine person which respects you and everyone and wants to be respected. Link to comment Share on other sites More sharing options...
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