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How best to increase canvas size of JPG and save as JPG

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Say I have a JPG

I want to increase the size of the canvas

How can I then save the file as a jpg - without losing quality?

If I choose 100% I can end up with a big file.

If I choose less quality, I lose quality.

JPG - by definition optimises and reduces file size (correct me if I'm wrong).

I get that. But then I can use a program like Windows Paint and increase the canvas without compromising the file size or quality.

Am I missing something?

Thanks.

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Hi,

To increase canvas size, just go to "Document - Resize canvas". It has options to let you resize as you want.

As regards getting a jpeg, you can't save as jpeg, you have to export as jpeg. But you probably know that already. I have noticed that just reducing the quality to 90% reduces the file size to a large extent without appreciably reducing the quality. Also, if you're still concerned, change the resampling option to bicubic or lanczos instead of the default bilinear.

Hope this helps.

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4 hours ago, gurunath said:

As regards getting a jpeg, you can't save as jpeg, you have to export as jpeg. But you probably know that already.

No, if Open JPEG, then Save JPEG.

See "pencil" note:

https://affinity.help/photo/en-US.lproj/pages/GetStarted/save.html

 

6 hours ago, enginestar said:

But then I can use a program like Windows Paint and increase the canvas without compromising the file size or quality.

Really? With lossy JPEG file?

 

6 hours ago, enginestar said:

If I choose 100% I can end up with a big file.

With lossy JPEG, even 100% (best quality) is still a loss of quality. You would need to use the lossless JPEG2000 (JPEG-LS).


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Thanks for the replies.

None of this makes sense.

ALL I want to do is append white space to the jpg.

I don't want to 'recreate' a jpg.

Paint on Windows 'seem's' to do this. (I could be wrong.)

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So add white space either manually with crop tool or numerically with Canvas size -command. Simple save will overwrite your old file with 100% quality JPEG. With Export you can choose quality/size ratio.

Admittedly people say AP JPEG quality is not the best so for best quality/size ratio other tools are better.

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6 hours ago, enginestar said:

ALL I want to do is append white space to the jpg.

Just write in the question, and you will be answered correctly.

https://affinity.help/photo/en-US.lproj/pages/SizeTransform/canvasSize.html

Anchor point to Center, add size with desired space (x2). 

 


Affinity Store: Affinity Suite (ADe, APh, APu) 1.8.5.703.
Windows 10 Pro, Version 20H2, Build 19042.610.
Dell Latitude E5570, i5-6440HQ 2.60 GHz, 8 GB, Intel HD Graphics 530, 1920 x 1080.
Dell OptiPlex 7060, i5-8500 3.00 GHz, 16 GB, Intel UHD Graphics 630, Dell P2417H 1920 x 1080.
Intel NUC5PGYH, Pentium N3700 2.40 GHz, 8 GB, Intel HD Graphics, EIZO EV2456 1920 x 1200.

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