MepMeeep Posted December 25, 2020 Posted December 25, 2020 I try to resize an jpeg image. I open it with Affinity Photo and want to create an image size 12x17cm. But when I choose document > resize document and give the new size in px, the image is resize but the quality is very bad. Why does it not resample the image?
walt.farrell Posted December 25, 2020 Posted December 25, 2020 14 minutes ago, MepMeeep said: I try to resize an jpeg image. I open it with Affinity Photo and want to create an image size 12x17cm. But when I choose document > resize document and give the new size in px, the image is resize but the quality is very bad. Why does it not resample the image? What was the original size in px of your jpeg file, before you did the resize? What resample method did you choose? Can you provide some screenshots? -- Walt Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases PC: Desktop: Windows 11 Pro 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 Laptop 1: Windows 11 Pro 24H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU. Laptop 2: Windows 11 Pro 24H2, 16GB memory, Snapdragon(R) X Elite - X1E80100 - Qualcomm(R) Oryon(TM) 12 Core CPU 4.01 GHz, Qualcomm(R) Adreno(TM) X1-85 GPU iPad: iPad Pro M1, 12.9": iPadOS 26.0, Apple Pencil 2, Magic Keyboard Mac: 2023 M2 MacBook Air 15", 16GB memory, macOS Sequoia 15.6.1
Fixx Posted December 25, 2020 Posted December 25, 2020 Probably mixed resampling and resizing and physical size and size in pixels.
MepMeeep Posted December 25, 2020 Author Posted December 25, 2020 from 3024 px x 4032 px and 72dpi to about 12cm width which is 340px x 453 px with resambling bilinear
JohnZeman Posted December 25, 2020 Posted December 25, 2020 After you have resized the image did you go to Menu > View > Zoom > 100% (CTRL + 1 on Windows) To show the image at its new full size?
walt.farrell Posted December 25, 2020 Posted December 25, 2020 51 minutes ago, MepMeeep said: from 3024 px x 4032 px and 72dpi to about 12cm width which is 340px x 453 px with resambling bilinear 3024 x 4032 px @ 72dpi would be about 42 x 56 inches (or about 107 x 142 cm). What you did was to drastically reduce the pixel count. You reduced the total pixel count to about 1% of what it originally was if I've done the arithmetic correctly. That cannot possible maintain the same sharpness. If you wanted your image to have a 12cm width you could have simply changed the dpi value while keeping the number of pixels constant. A dpi value of 600 would do that. (Or, you could cut the number of pixels in half (approximately 1500 in width) at a dpi of 300.) -- Walt Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases PC: Desktop: Windows 11 Pro 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 Laptop 1: Windows 11 Pro 24H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU. Laptop 2: Windows 11 Pro 24H2, 16GB memory, Snapdragon(R) X Elite - X1E80100 - Qualcomm(R) Oryon(TM) 12 Core CPU 4.01 GHz, Qualcomm(R) Adreno(TM) X1-85 GPU iPad: iPad Pro M1, 12.9": iPadOS 26.0, Apple Pencil 2, Magic Keyboard Mac: 2023 M2 MacBook Air 15", 16GB memory, macOS Sequoia 15.6.1
MepMeeep Posted December 26, 2020 Author Posted December 26, 2020 @walt.farrell this works. Thanks. But why do I have to do this manually. In photoshop if I resize the image it works automatically?
Minus44 Posted December 26, 2020 Posted December 26, 2020 52 minutes ago, MepMeeep said: @walt.farrell this works. Thanks. But why do I have to do this manually. In photoshop if I resize the image it works automatically? Photoshop isn’t doing this as automatically as you might think. Affinity Photo is managing the image with very similar tools, but you may not be as familiar with them. You simply need to give it the DPI that you want in the final result. If you uncheck a box or two in Photoshop, it would do the same thing.
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