only if the original
image is as large as the largest dragable size.
increasing the size of the
image beyond its actual size creates interpolated pixels, 'best fit of color' that may not be correct or creates visual pixels that are multiple screen pixels in size, 'blocky' images.
If the
image is initially served at a small size,
a larger
image can be background loaded by a script,
page times are not impacted,
the effect can be seamless.
example code only, not checked or correct
where "onresize" is some defined action havent bothered to code
<!doctype>
type='text/javascript'>
onload='imageload()'>
src='thumbsize.jpg' onresize='self.src="fullsize.jpg"' alt='drag to resize image'>
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