Image Sizes

[appleman]

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I notice that the image sizes on my memory card are different, i.e. the jpeg size is smaller that the DNG files. Anybody know how to make both file sizes the same?

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[mmradman]

DNG files are always recorded uncompressed at max resolution of 6000x4000 or 24Mp, typically 40Mb or more per file.  

JPGs can be recorded in three sizes, small [6Mp], medium [12Mp] and large [24Mp], even the largest JPG will be always smaller in "Mb" size than counterpart RAW, there is nothing to be done about it.

[appleman]

Just as I thought, thanks.

[appleman]

Just one thought. Although the image size is smaller in pixels it is also smaller in dimensions. But as you say, nothing can be done about it.

[douglas fry]

Its down to the nature of the two formats, RAW is the uncompressed image file straight off the sensor, a jpg is created by the camera by chucking out what it thinks as redundant information and then compresses it which is lossy too. If you open a jpg in Photoshop it is decompressed and much larger in size.

Try using JpegMini Pro https://www.jpegmini.com/creators?gclid=EAIaIQobChMIp-7f0vfk3gIVarHtCh0QBwh9EAAYASAAEgJU8fD_BwE#utm_source=google&utm_medium=cpc-ongoing-brand&utm_campaign=jpegmini-pro&utm_content=jpegmini-pro

Its software that chucks out ALL redundant data without changing its pixel dimensions or its appearance so a jpg can be MUCH smaller but look no different, fantastic for websites or emailing images, I include it in all jpg export actions in LR

 

[caissa]

If you select large jpegs then the dimensions should be identical, 6000x4000 . You can change that in the settings for jpegs. But this is not related to the actual file size, which is different depending upon the amount of compression and the data/detail inside the photographed object.

Edited November 21, 2018 by caissa