Z6 vs Z7 Image Quality Difference

Started 4 months ago | Questions thread
JimKasson
JimKasson Forum Pro • Posts: 30,021
Don't downres
1

michaeladawson wrote:

Calibur wrote:

If the final target for my image is a 5MB JPG, will the Z7 produce a better image than a Z6?

Saying "5MB JPG" doesn't mean much. Or maybe it does. If I save a full resolution Z7 file as a JPG at full quality out of Photoshop it is usually well over 30MB. I have to down-rez the image to around 2400x3600 pixels to get something close to a 10MB JPG at full quality. I can then get it down to 5MB by reducing the JPG quality. So were looking at a 8.5 megapixel image at this point.

In general, if file size is the constraint (not the output device), it is better to reduce JPEG resolution than to downres the image. There are some corner cases where that isn't true, but using the relatively intelligent and psychology-aware compression of the JPEG DCT algorithm is almost always better than the meat-ax approach of downsizing.

Jim

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