With 'Resample' off, the program will simple take the existing
number of pixels within the image and stretch them over a larger area. The file
Size (Mb) for the image will not change.
Note About Resampling
Remember, for 'photographic quality', keep the Pixels
Per Inch (ppi) for the final image at around 200ppi or more (there's not a lot
of advantage in going beyond, say, 230ppi).
With 'Resample' is ticked, the
program will invent pixels and the file size will increase - perhaps to an unacceptably
large size! Be very wary of this.
Of course it's perfectly OK to 'resample'
but do keep an eye on the file size.
Resampling is often done in an attempt
to retain definition in an image when it's stretched / enlarged to a size where
it falls below 200ppi.
larger the amount of resampling that you have to carry out the more noticeable
any inaccuracies will be. There is no hard and fast rule about this as the results
are image dependent.
of us try not to resample upwards unless absolutely necessary.
Only choose 'Resample' when you are very certain that you really wish to
When decreasing image size with 'Resample' off, the
program will retain the same number of pixels in the image but they will be reduced
in size and occupy less on-screen space. The ppi will therefore increase, however
the 'File Size' (Mb) for the image will remain the same.
are resizing and 'resampling' to smaller image dimensions then 'Resample' is not
such a problem. However, please remember that doing this will irrevocably discard
pixels. Note: the File Size (Mb) will decrease.
Note that when 'Resample' is ticked boxes also appear to 'Constrain
Proportions' and 'Constrain Styles'.
you wish to make disproportionate changes (e.g. stretching the width whilst retaining
the height), then keep all boxes ticked.