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> I find that most photos from an iPhone can be scaled down to ~400KB in an image editor and be indistinguishable from the original. What do you mean by "scale
by gvb 5y ago
> I find that most photos from an iPhone can be scaled down to ~400KB in an image editor and be indistinguishable from the original.
What do you mean by "scaled down?" Scaled down implies reduced size. Are you reducing the size (fewer pixels) or increasing the compression with the same effective size (same number of pixels)?
How do you judge that it is indistinguishable from the original? If you zoom in on the original vs. the scaled down image I expect you will see a difference.
- computator 5y agoIn my experiments I was reducing size (fewer pixels). > If you zoom in on the original vs. the scaled down image I expect you will see a difference. I do not see a difference (other than noise) if I zoom in. I.e., I can almost always scale down to a size that is some fraction of original in which the original and the scaled down photo are indistinguishable even when zoomed in. I'll zoom in on something like the license plate on a car to judge the point at which the original and resized images are equally readable or equally un-readable.