Nikon Z8 User Manual page 324

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Cautions: Retouch
The camera may not be able to display or retouch images that were taken or retouched using other
cameras or that have been retouched on a computer.
If no actions are performed for a brief period, the display will turn off and any unsaved changes
will be lost. To increase the time the display remains on, choose a longer menu display time using
Custom Setting c3 [Power off delay] > [Menus].
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Cautions: Retouching Copies
Most items can be applied to copies created using other retouch options, although multiple edits
may result in reduced image quality or unnatural colors.
The effect produced may vary with the order in which edits are performed.
Some items may be unavailable depending on the items used to create the copy.
[Retouch] items in the i menu that cannot be applied to the current picture are grayed out and
unavailable.
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Image Quality
Copies created from NEF (RAW) pictures will be saved in JPEG or HEIF at an [Image quality] of
[JPEG/HEIF finem].
Copies created from JPEG and HEIF pictures are the same quality as the original.
In the case of dual-format pictures recorded to the same memory card at image-quality settings of
RAW + JPEG/HEIF, only the NEF (RAW) copy will be retouched.
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Image Size
Except in the case of copies created with [RAW processing (current picture)], [RAW processing
(multiple pictures)], [Trim], [Resize (current picture)], and [Resize (multiple pictures)], copies are
the same size as the original.
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Retouching Photographs