resizing pics...

Discussion in 'Photography Beginners' Forum' started by aparis99, Nov 25, 2006.

  1. aparis99

    aparis99 TPF Noob!

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    What software do you all use to resize ur images? I'm under the impression that resizing causes some quality loss, at least from what i can tell with diagonal lines and such, they seem more jagged... maybe they dont i dont know.

    I've seen the Windows resizer, photoshop kinda takes a while, Infranview is ok, anyone have any fav's?

    Example: a pic that's 2-3mb, the windows resizer can make it 'large' 1024x768 and it will end up only like 40kb! How is that possible without losing quality?
     
  2. fmw

    fmw No longer a newbie, moving up!

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    It loses plenty of quality. You just can't see it because you are looking at a low resolution JPEG on a computer monitor. If you were looking at a print the difference would be obvious.
     
  3. sp_key

    sp_key TPF Noob!

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    Hi,

    Are you talking about upscaling or downsclaing? For downsizing you really shouldn't tell a difference as long as you keep the original aspect ratio.

    Resizing is a long debate amongst professionals and there are many parameters that affect the end quality. One of them is whether you are using a Bilinear, a Bicubic or a Lanczos resizer. You should try and use them all and make comparisons. As a rule bilinear resizers are softer than bicubic and Lanczos.

    Photoshop's power comes from its extendable capabilities. There are hundreds of professional plugins designed having photographers in mind. I've seen a few plugins and they are very impressive. Unfortunatelly I cannot any in specific but you should be able to Google them very easily. Just add them to Photoshop and try them before you make a decision to purchase. Some of them might even be free.

    Googling ''photoshop plugins + resizing'' came with a few links. One of them is: http://www.fredmiranda.com/RP/
    also: http://photoshop.pluginsworld.com/plugin.php?directory=adobe&software=photoshop&plugin=188

    Bear in mind that you achive best results by creatively mixing plugins.
     
  4. Alex_B

    Alex_B No longer a newbie, moving up!

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    Well depnding on by which fraction of the original you downscale, and by the algorithm you use, you might lose sharpness when downscaling. But a hint of PS-sharpening then does the job to compensate.
     
  5. Garbz

    Garbz No longer a newbie, moving up!

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    It's a lossy process, take that old pic and zoom it to 400% to see the effect of what resizing has done. Whereas the old picture may be 1024x768 at 25% zoom, at 100% it should still be sharp.

    Also I use a Lanczos based resizer. It gives me so far the nicest image from all. Photoshop has not got one yet though.
     
  6. aparis99

    aparis99 TPF Noob!

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    any links on the stuff you are talkin about?
     
  7. sp_key

    sp_key TPF Noob!

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  8. aparis99

    aparis99 TPF Noob!

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    I'm pretty much just wanting to downsize everything, i take all pics superfine and they are just too large, i use them mainly for web, rarely print, but maybe some 4x6's here and there, maybe i should just make the resolution on the camera smaller?
     
  9. Alex_B

    Alex_B No longer a newbie, moving up!

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    ahhh. noo never do that!

    you might bitterley regret if you want to make a large print from one of them next year.
    someone might ask you if he could have a higher resolution version for a magazine or anything can happen ... therefore: always archive at the native resolution of your camera ... with maximum information in the image.
     
  10. ANDS!

    ANDS! No longer a newbie, moving up!

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    If you have PS - you can either set up your files to be batch-processed (and thus resized), or you can create a PS ACTION to do it all within PS.
     
  11. aparis99

    aparis99 TPF Noob!

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    Well, i've used PS CS2 but go for so long w/o using it i forget everything. so right now i've got Photoshop Elements 5... i'll figure out a way
     

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