Help resizing to print 8x10

Discussion in 'Photoshop Tutorials' started by Fjx1, Nov 26, 2004.

  1. Fjx1

    Fjx1 Guest

    I know this is a beginner question but here goes.

    I'd like to print an 8x10. The pic was taken with enough resolution to print
    at 300 dpi. When does one click resample, when not? I see different things in
    different books. Is constrain always checked?


    Fjx1, Nov 26, 2004
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  2. Fjx1

    Peadge Guest

    What is the size and resolution of the original? If it is one 0.8 inches by
    1 inch at 300 ppi, and you change the size to 8 inches by 10 inches with
    resample unchecked, Photoshop will change the image to 8 inches by 10 inches
    at 30 ppi. Without resampling enabled, Photoshop does nothing to alter the
    pixels, it just alters the resolution. When resampling is enabled, Photoshop
    uses a formula to make an educated guess at how the image should be
    resampled. If you are reducing the size, Photoshop MUST remove some pixels
    since the new version will have less pixels, and resampling is it's method.
    If you're making the image larger, Photoshop will have to add pixels that
    weren't in the original, and resampling is how it accomplishes this.

    Constraining proportions is usually a good idea, since it maintains the
    ratio between height and width.

    So my guess is that your image is much bigger than 0.8 by 1 inch and at a
    descent resolution. You should probably change the size with Resample Image
    checked as well as Constrain Proportions.

    Another method would be to create a new file that is 8 by 10 at 300 ppi.
    Then drag your image into this one while holding down the SHFT key to center
    it. The press CTRL +T to resize, again holding the SHFT key to constrain
    proportions. Changing the size in this way uses resampling too.

    Peadge :)
    Peadge, Nov 26, 2004
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  3. Fjx1

    Odysseus Guest

    The main reason for upsampling is to avoid the appearance of artifacts,
    _viz_ 'pixelation', due to inadequate resolution. This can't create
    detail that wasn't there to start with, of course, but it can make the
    'jaggies' disappear, producing a reasonably smooth, albeit often
    somewhat blotchy, result. When upsampling by a large amount it's
    generally best to do it in stages; my rule of thumb is to enlarge to no
    more than double the file size -- about a 140% increase in the linear
    dimensions -- in one go.

    The three main reasons for downsampling are to reduce the file's size,
    to prevent the rendering of details smaller than can be reproduced, and
    to make the appearance on screen a better predictor of the sharpness of
    the output. (I'm thinking of halftone screening for prepress as the
    intended destination: some different considerations apply to other types
    of imaging, like dithering as done by an inkjet printer or like the
    'stochastic' screening sometimes used in high-end offset printing.)

    Whenever in doubt, resize without resampling; in this case all you're
    changing in effect is the rulers, the image itself remaining untouched
    -- and it happens more or less instantly. Once you're at the final print
    size you can evaluate the resolution, sharpness, &c., and decide whether
    resampling will be required.

    Constraining proportions is the default, most likely to avoid the
    accidental distortion of an image by disproportionate scaling, which
    should be considered a 'special effect' rather than a standard behaviour.
    Odysseus, Nov 26, 2004
  4. Fjx1

    Aerticeus Guest

    Try this

    with acknowledgements to /\BratMan/\

    Aerticeus, Nov 26, 2004
  5. Fjx1

    Aerticeus Guest

    ps - if you really want to automate it save the action as a droplet

    Aerticeus, Nov 27, 2004
  6. Fjx1

    Tacit Guest

    I'd like to print an 8x10. The pic was taken with enough resolution to print
    In English, the word "resample" means "change the number of pixels." You click
    "resample" when you want to change the number of pixels--for example, to make
    the image smaller for Web use.

    Changing the number of pixels, either upward or downward, does degrade the
    quality of the image. When you resample and create more pixels, Photoshop must
    "guess" what those pixels should be; it can never create new image detail that
    isn't already there. As a result, the image becomes soft and blurry. When you
    resample downward, Photoshop throws away pixels, and in the process throws away
    image detail.
    "Constrain" means "keep the picture the same shape." If you turn off
    "constrain," you will end up stretching or squashing the picture.
    Tacit, Nov 29, 2004
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