Slains Castle

by pakman

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comment Why are two pictures that are the same dimensions/dpi such different file sizes?
Once you've removed extraneous metadata, the only way to reduce the file size is to reduce the amount of information in the image. You do by cropping, down-sizing, or reducing the Q ("quality") factor the the jpeg image. You can typically reduce to q=75 (not sure what the exact photoshop equivalent is) before you get noticeable artifacts (without zooming to look at individual pixels) but it varies from image to image.
comment how to backup large amounts of photos at home?
Lots of good answers. Just recognize that you need both archive and backup! They are not the same thing. An archive is a backup with history so that you can go back and find previous versions of modified (or deleted) files. CrashPlan is good for this but make sure you have two different systems in case one goes bad or doesn't work as you expect. (
comment Why don't cameras capture dynamic range as our eyes do?
Cameras can. Film has a "shoulder" that is similar to the eye. Digital can have paired large/small sensors to capture enhanced dynamic range. Software can combine this and produce a display, even on today's monitors, that reflects what your brain would register if viewing the image directly.