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In Photos, is it possible to convert a 10,7 Mb colour photo into black & white and then save it as a separate file of same size to disk? (colour photo imported from Pictures on disk).
Thank you
MacBook Pro 16″, macOS 13.0
I just took a 10.5 MB jpeg color image and converted it to B/W and exported at full size (pixel-wise), Maximum JPEG Quality and got the same pixel dimensions in a 7.9 MB jpeg image file. So you lose about 30% file size by removing the color info.
If you used JPEG Quality as High the file size would have been even smaller.
I just took a 10.5 MB jpeg color image and converted it to B/W and exported at full size (pixel-wise), Maximum JPEG Quality and got the same pixel dimensions in a 7.9 MB jpeg image file. So you lose about 30% file size by removing the color info.
If you used JPEG Quality as High the file size would have been even smaller.
Same size? If you mean dimensions, yes. If you mean file size, well you're throwing away data - the colour information - so the resulting file will be smaller in terms of KB or MB.
Anyway you can do it by converting to B/w in Photos and then exporting the image.
Photos: conversion of colour into b&w then save as separate file
