how to balance img dimension decrease w/ quality

lets have 1800x1200 img , want upload on web @ 360x240

 

does make sense lower quality of image because of fact smaller image, pixels compressed , hence u can reduce quality without affecting how picture looks

 

if so, there standard ratio of image size shrinkage quality % reduction....or maybe more simple quality % can image without decreasing image looks?

 

and finally, there actual difference between standard exporting , exporting "save web" option because same configurations, seems file sizes exact same

in order:

 

yes.

 

are referring quality when exported "lossy" file format jpeg? there's going reduction in quality. if you're referring resampling while resizing, "bicubic sharper" way go reductions. (check out under image > image size on menu bar , choose "bicubic sharper," under resampling option. can leave on automatic too; photoshop pretty @ choosing right resampling option based on enlargement or reduction.)

 

that depend. see above. jpeg saved @ 60% quality not going have detail jpeg saved @ 90% smaller in file size.

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