Image quality

[Antonio Macias]

Hello, good afternoon. I would like how can I reduce the size of an image - document without losing definition-quality?

[John Rostron]

Hello @Antonio Macias, and welcome to the forum.

You need to use the Document > Resize Document and choose the appropriate algorithm. See the Affinity Help 

File here:

https://affinity.help/photo/en-US.lproj/index.html?page=pages/SizeTransform/imageSize.html?title=Changing image size

John

[NotMyFault]

49 minutes ago, Antonio Macias said:

Hello, good afternoon. I would like how can I reduce the size of an image - document without losing definition-quality?

I would say this is next to impossible.

Can you be a bit more specific:

• Do you mean bytes or pixel count by size?
•  What file format is used (e.g. JPEG)?
• Do you have example images, and a clear description what "size" do intend to achieve?
• What is the intended usage of the image, e.g. uploading to web-site, printing, sending via chat apps, ...?

You can get smaller files (less bytes) by using file formats which support compression (e.g. PNG, TIFF, JPEG).

You can resize files to lower resolution and storage - but this always impacts "definition", e.g. level of details visible.

[Antonio Macias]

18 hours ago, NotMyFault said:

I would say this is next to impossible.

Can you be a bit more specific:

• Do you mean bytes or pixel count by size?
•  What file format is used (e.g. JPEG)?
• Do you have example images, and a clear description what "size" do intend to achieve?
• What is the intended usage of the image, e.g. uploading to web-site, printing, sending via chat apps, ...?

You can get smaller files (less bytes) by using file formats which support compression (e.g. PNG, TIFF, JPEG).

You can resize files to lower resolution and storage - but this always impacts "definition", e.g. level of details visible.

HI, good morning 

We use pixel.

jpeg

I want to reduce the size of a image of 1000 X 500 px  to  500 X 250 px  for to use to a web-site.   

My problem is that the quality of the image is very diferent and pour.

 

[Antonio Macias]

18 hours ago, John Rostron said:

Hello @Antonio Macias, and welcome to the forum.

You need to use the Document > Resize Document and choose the appropriate algorithm. See the Affinity Help 

File here:

https://affinity.help/photo/en-US.lproj/index.html?page=pages/SizeTransform/imageSize.html?title=Changing image size

John

HI John I tried in that way but always affect to the quality with a small size, thank you

[David in Яuislip]

Try bicubic resample with a little sharpening

[NotMyFault]

How do you rate the below image?


Actually, I used tone map persona to boost local contrast before resizing with bicubic. The source image looks very flat, not a good starting point for resize which reduces contrast further.