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 Post subject: Cropping and Photoshop
PostPosted: Thu May 31, 2012 4:23 pm 
Good day everyone!

Forgive me if this question goes not come across as clearly as I want it to.

I was messing around with my 60D last night and decided to shoot some shots of the moon with my 300mm.

Now obviously, there was a lot of black sky surrounding the moon so my question is, what is the best way in Photoshop to remove the sky?

If I crop and then upsize the image, then I assume I am going to lose detail?

I understand that if you crop, you lose PPI, so I suppose I am just trying to figure out how to crop an image but keep the image quality in tact.

I imagine many of you edit your photos for print.

Yikes there is a lot to learn...should have taken Photography in school, lol.

Thanks as always, enjoy your day everyone!

PostPosted: Thu May 31, 2012 4:31 pm 
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Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9886
Location: UK
Hi dieselpowered,

If you crop all you do is throw away unwanted pixels. The wanted pixels, the Moon in this case, are unaltered. Of course if you then magnify the wanted portion, either on screen or on paper, you can't display detail that was never there.


Sony RX1R II. Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, M.Zuiko Digital ED 40-150mm f/2.8 + 1.4x T/C, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8
M.Zuiko Digital ED 75mm 1:1.8, Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.

PostPosted: Thu May 31, 2012 5:45 pm 

Joined: Sun Jul 04, 2010 4:52 pm
Posts: 244
Location: NB, Canada
When cropping a picture, think of it as printing out the original picture, then cutting it down with some scissors, that's about what you're doing.

After the crop, some software will let you upscale the picture, and depending on the algorithms, it is not entirely possible to improve the cropped photo (also works with uncropped photos), but you can't take a picture with a 300mm lens and crop it + upscale it and expect it to look like the same picture taken from a 800mm lens originally. You might be able to pass it off as a 400mm though, and at least get rid of the distracting elements :)

Cameras: Canon EOS 6D, Canon EOS Rebel T3i, Canon EOS Rebel T2i, Canon S90
Lenses: Tamron: SP 24-70mm F/2.8 Di VC USD, SP 70-300mm F/4-5.6 Di VC USD, Rokinon: 8mm Fisheye cine, Canon: EF-S 18-55mm f/3.5-5.6 IS Lens, 75-300mm f/4.0-5.6 III, and EF 50mm f/1.8 II
Retired camera: Fujifilm Finepix s700

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