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Affinity Photo - Resize image without quality loss


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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
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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, 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

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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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