Help resizing to print 8x10

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?

Thanks,

Gerry

 

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

 

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.

 

Try this


with acknowledgements to /\BratMan/\

Aerticeus

 

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

A

 

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.