Photoshop: How do I change the dimensions in pixels,the file size(KB) and Aspect ratio of JPEG photos?

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Photo of Peter Credaro

Peter Credaro

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Posted 2 years ago

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Photo of Alex Furer

Alex Furer

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Hi Peter, Since you posted this under "All questions", a bit more information would be greatly appreciated. e.g. Which application are you talking about, LR, PS?

In case you mean Photoshop:
- You can change the aspect ratio by creating a selection with a fixed aspect ratio set on the top of the window once you are in the selection tool then crop the image to this aspect ratio.

- You can change the dimensions under: image -> image size
- And finally you can set the compression (quality) when you are saving the image. You will have to fiddle with the compression setting to get the desired KB. But if you use the legacy exporter (Alt-Shift-Control-S), it will show you a preview of the image and tell you how "heavy" the exported image will be.

In case you are talking about Lightroom:
- Press "r" to get to the cropping tool. A grid will pop up in the image. On the right hand side you have a drop down with all kinds of aspect ratios, plus you can setup your own. Pro tip: For image composition aids while cropping, you can press "o" while in the cropping mode to change the display of the grid.
- Image size and compression (quality) can be set in the export dialog. There's even a KB setting.
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Peter Credaro

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Hi Alex,

Thanks appreciated,once I download a copy of Photoshop I can play with the settings to change pixel size and aspect ratio using this information  Regards  Peter