bicubic smoother/sharper

Discussion in 'Graphics Programs and Photo Gallery' started by notelliot, Feb 19, 2008.

  1. notelliot

    notelliot TPF Noob!

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    hey guys.

    i was going through old files and from some 'ancient' jpegs from my d70s. i was going to print some 13x19's but i need to know if i'm upsizing properly. i'm using photoshop cs. here's the process:

    -open image (in this case let's say it's 3008x2000px)
    -using the bicubic smoother, i increase the image size by roughly 20% (img is now 3610x2400px)
    -now using the bicubic sharper, i resize to the size required (back to 3008x2000px)
    -print?

    it feels like there's a step missing. any info is good info. thanks in advance.
     
  2. Digital Matt

    Digital Matt alter ego: Analog Matt

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    Why are you enlarging, and then resizing down again? Resize the image one time, using bicubic smoother (since you are enlarging). If you are printing at 300 dpi, the final pixel dimensions should be 3900x5700 for a 13x19.

    Some people feel that making gradual steps up the desired resolution results in a cleaner image. I have not seen any reason to do this, but that's your option.
     
  3. notelliot

    notelliot TPF Noob!

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    that's probably what was throwing me off. i didn't understand why i would resize back to the original after making the thing larger.
    i called a friend to ask him, and that's what he said to do.

    i don't know a lot about printing.

    know of anything i can read online that would help at all? i have too many questions to ask.
     
  4. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    I agree with Matt, there is no reason to go back and forth with your image size.

    If anything, you might want to sharpen after you resize.
     
  5. notelliot

    notelliot TPF Noob!

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    okay.

    so if i'm using the smoother to enlarge, what does the sharper really do? it appears that i don't need to bother with it?
     
  6. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    They way I understand it, when you enlarge, you do it 'smoother' so that you get a more natural looking image and smooth out the details that have to be made up.

    Sharpening might bring back a touch of sharpness and edge detail.

    It doesn't take much. I think that I usually use something like 200% but only 0.2 or 0.3 radius. (Unsharp Mask)
     
  7. domromer

    domromer TPF Noob!

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    I've heard it argued back and forth which way to do it.

    I almost alway make images smaller and I've found bicubic sharper to work better.
    This is the opposite of what a lot of books will tell you but I always have better results when I choose it over smoother.
     
  8. notelliot

    notelliot TPF Noob!

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    you're making the image smaller in this case, and i'm trying to enlarge images. unless the process is the same. i've always just used a bicubic sampler to resize smaller.
     
  9. domromer

    domromer TPF Noob!

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    I also just read a good article where Scott Kelby uses bicubic sharper to make poster size prints form a 6meg file.

    Maybe I'll scan it if I have time.
     
  10. ann

    ann No longer a newbie, moving up!

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    which article, as i would like to point some students in that direction.
     
  11. notelliot

    notelliot TPF Noob!

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    please do. even if i could make 8mb and 20mb files cleaner at poster size.

    the only reason i regret not going to school (i guess i still could) is for photoshop. is pretty extensive to teach yourself.
     
  12. Digital Matt

    Digital Matt alter ego: Analog Matt

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    The size of the file itself, in mb has nothing to do with it's quality for enlargement. The main factors which influence enlargement are sharpness, noise/grain, and pixel dimensions (this is the true inherent resolution of the file, and what you are manipulating when you enlarge).
     

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