When this original is enlarged,
the lossiness of the original is evident. Since the original was
a low resolution image, there simply was not enough information in
the photo to enlarge it satisfactorily. See the two examples below.
You can clearly see what the human eye missed: dots in the
original that are not visible until the image is enlarged.

As you can see, when a low resolution
image is enlarged, even the best scanned image using the best photo
enlargement software (Imagener,
of course)
is only enlarging content that simply does not exist - pulling
apart what is there and revealing what is not. 
The high resolution scan served to create a really detailed image
of the dots that the scanner could "see," then the enlargement process
perfectly enlarged the dots. Images taken from websites can often
be much worse than this, completely coming apart into large blocks
when enlarged. This is because in their original form they may look
okay, but the human eye is really looking at very little actual digital
content.
Again, the original image in this example was scanned in at an extremely
high resolution - 1200 dpi - but the beginning image just did not
have sufficient content for image
enlargement purposes even though
the human eye sees a beautiful picture in its original form. If in
this
case the picture we scanned had been a glossy actual photograph with
at least 300 dpi resolution, the image could have been enlarged or
used to create a beautiful wall
mural.
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