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Is this the dreaded moire?

km6xz

St Petersburg, RU
3559 posts

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"RE: Is this the dreaded moire?"

km6xz Moderator Awarded for his in-depth knowledge in various areas, including Portraits and Urban Photography Nikonian since 22nd Jan 2009
Fri 28-Dec-12 04:43 PM

The differences are not readily seen on a low res monitor with a small display with restricted dynamic range so for many more casual images for web or small prints JPG as a storage and presentation medium is fine.
Printing with high resolution and wide color bit depth, you will see a difference provided a representative sample in both formats have minimal post processing. Every time you save the jpg file after any modifications or editing, the jpg loses data that can't be recovered.
If you are doing any work on a jpg file, do not edit the original, only use a copy of the original and save it as a new file name so that a minimum of lossy compression cycles will be used on the file. There will still be a minimum of two lossy compression's. Each cycle of compression really degrades the file so after a few edits, it is not suitable for printing in any sort of quality.
The 14 bit data recorded in RAW has much more information about color and luminance than the 8 bit JPG, since each additional bit doubles the data, RAW records a great deal in much finer steps in color or tone. The RAW file allows more extreme rescues or modifications can be performed without degradation of the original file, which is kept intact. Lossless compression of RAW files is just that, it loses none of the information whole reducing the size of the file in the compression process.
So the final presentation media is the determining factor as to whether JPG is good enough. Printing large or with high resolution with a printer and medium that an display the wider dynamic range, RAW is a must for the best quality.
Stan
St Petersburg Russia

Visit my Nikonians gallery.

A topic tagged as having a question Is this the dreaded moire? [View all] , Ed_in_Tucson , Sun 23-Dec-12 05:49 PM
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