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I didn't take my pictures in RAW mode and have a tilted horizon. Don't have Photoshop, only whatever tools came with my Canon 450D, which seem to only work with RAW mode pictures.

How do I do this?

Thanks!

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Squint Horizon? What? – Fake Name Jun 22 '11 at 0:44
Skewed horizon? – Matt Grum Jun 22 '11 at 7:39
Tilted horizon is the most common term. – Itai Jun 22 '11 at 13:00
Didn't realise there was a correct technical term for a non-horizontal horizon :-). Or is it just my uneven arms? – Graeme Jun 25 '11 at 15:39

4 Answers

up vote 7 down vote

Never seen an imaging software that could not do that, so yes, you can do this.

Adobe Lightroom has a great tool to do that which is interactive. It does cost money, so I would not buy it just for that (there are excellent reasons to do so though).

Google Picasa is free and can do that. Look for the menu item that says 'Straighten'.

It does not matter which file format you used, rotating a digital image slightly is always very destructive to image quality. If you can take the photo again, just to back and be careful. If your camera does not have a digital-level built-in, you can buy a bubble-level that fits in the hot-shoe.

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Canon Digital Professional can't - it seems to only be able to do that with RAW images. Will look at these other tools tomorrow. Pity about the destructive bit though - can't just go back and click that brilliant photo again unfortunately. – Graeme Jun 21 '11 at 19:55
@Graeme DPP can do, I've put how in an answer 'below' – Dreamager Jun 22 '11 at 11:57
up vote 5 down vote

You can use just about any program out there that works with images:

  • Paint.NET is a good one for Windows
  • Gimp is another good one (but a high learning curve)
  • Picasa is a nice basic one
  • Or even online offerings like picnic.com or photoshop.com.
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up vote 1 down vote

Irfanview can do these transformations with raw and jpg. There are ways to crop without resampling the jpg as well. Resampling is not a good thing for JPG files which are already lossy (meaning that you throw away some of your image data every time you create another version, much like making successive photocopies).

You can also do much more with GIMP.

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1  
Note that both of these programs are zero-cost. (And Gimp is open source.) – mattdm Jun 21 '11 at 23:22
up vote 1 down vote

Canon Digital Photo Professional can crop and rotate JPG as well as RAW. Browse to the jpg file in Digital Photo Professional, right click on it and choose Open in Edit Window, then when that has opened click Tools and then Start Trimming/Angle Adjustment tool. All your cropping and rotating can be done in there. If for some reason it's not letting you, maybe you need to update your version of DPP from the Canon website.

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+1 This is probably the best solution as the questioner states he already has the Canon software. – Matt Grum Jun 22 '11 at 7:40
I had DPP 2.2 - upgraded to 3.4.1.1 but I only see a "Start Trimming tool" option - nothing about angle adjustment. Looked at Paint.Net but can only see the usual 90 degree rotation options. – Graeme Jun 25 '11 at 15:34
Wow, I see there are many newer versions, possibly even 3.10 but I can't find a decent download link, not even on the Canon web site. Can someone help please? – Graeme Jun 25 '11 at 15:54
Finally found 3.10 here: software.canon-europe.com and am happily straightening my horizons. Thanks all. – Graeme Jun 25 '11 at 16:27

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