photoshop resizing problem

Discussion in 'Beyond the Basics' started by ajmall, Nov 29, 2004.

  1. ajmall

    ajmall TPF Noob!

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    i've noticed recently that when i reduce the size of my photos (usually by a significant amount around 50%) they actually lose quality and become grainy.

    i use the "image size" tool and have altered both pixels and dimensions yet it makes no difference. how can i stop this from happening? or, how can i reduce image file size with only reducing the image size by 20% and without losing quality?

    thanks
     
  2. Mo

    Mo TPF Noob!

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    Only change one value and check the "Constrain Proportions" box. Mine never lose quaility.

    The "Constrain Proportions" box is at the bottom of the resize window, if you don' already know.
     
  3. ajmall

    ajmall TPF Noob!

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    i did that but i still didn't get the desired effect. i need the file size to be small without losing quality
     
  4. Mo

    Mo TPF Noob!

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    I see. I have also experienced something similar: my Coppermine photo gallery creates a 400 pixel, 22Kb intermediate image, while in Photoshop it was 88Kb at JPG 7. Alything below that looked worse than the 22Kb image. I don't fully understand this, either.

    How big (in pixels) are your images and what size do you want to resize them to?
     
  5. ajmall

    ajmall TPF Noob!

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    well i'm working in cm as the numbers are smaller and easier. the pixel size varies but the most recent i tried was about 1500 by 1900. i reduced the image size and it went really grainy. strange thing is you only expect that when u make an image bigger!
     
  6. Mo

    Mo TPF Noob!

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    Strange.. :?
     
  7. MarylandMatt

    MarylandMatt TPF Noob!

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    Are you zooming in at all? Or viewing the image at 100% I know that sometimes on PS7 when I zoom in, it will get pixelated of course. Even at 110% it will look fuzzy.
     
  8. ferny

    ferny TPF Noob!

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    Does it look grainy or are you really seeing jagged lines?
    Think about this, get a piece of cloth 6"x6" and lay it flat on a surface. Now push the sides in until it is 3"x3". Not flat is it?
    A similar thing happens when you make an image smaller. Except because it's 2d and not 3d the bits of cloth poking up in the air get thrown away. As a result, perfect circles and straight angled lines became jagged. Straight horizontal and vertical lines are fine. So the loss in quality of certain images doesn't always notice. At other times, it can ruin the entire photo.
    The more you resize the image, the more that gets thrown away the worse it looks. Photoshop is very good at resizing images.
     
  9. Nytmair

    Nytmair TPF Noob!

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    also, if you are saving the image for web (i.e. as a jpeg or gif) you are able to change the quality at which you save the photo... i usually do 80% (high quality) but you can go higher or lower.... obviously the highter quality, the higher the filesize as well.

    Just another thing to check :)
     
  10. BernieSC

    BernieSC TPF Noob!

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    When I resize a photo I always use the smart blur or blur the photo slightly that cleans up pixelation when you reduce the size and if it looks a little blurry after resizing i use the sharpen edges filter.

    If you haven't tried the smart blur filter try it. I love that filter it really makes smoothing and adding a great look to the photo really easy.
     
  11. ajmall

    ajmall TPF Noob!

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    no im not zoomed in past 100%

    thanks for the tips. i'll give blurring a go.
     
  12. jadin

    jadin The Mad Hatter

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    Are you using bicubic resizing? If so that's your problem. It might work for upscaling but downscaling makes it look horrid. Try the other options until you find which one looks best.

    I'd just tell you which it is, but I use paint shop pro which has a "smart size" and works insanely better than any of the other options.
     

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