Nikon D3100 - Manual (Page 80)

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Image Quality and Size
Together, image quality and size determine how much space each photograph
occupies on the memory card. Larger, higher quality images can be printed at larger
sizes but also require more memory, meaning that fewer such images can be stored
on the memory card (
0 187).
Image Quality
Choose a file format and compression ratio (image quality).
1
Place the cursor in the information display.
If shooting information is not displayed in the monitor, press the P button.
Press the P button again to place the cursor in the information display.
2
Display image quality options.
Highlight the current image quality in the
information display and press
J.
Option File type Description
NEF (RAW) +
JPEG fine
NEF/
JPEG
Two images are recorded: one NEF (RAW) image and one fine-quality JPEG
image.
NEF (RAW) NEF
Raw 12-bit data from the image sensor are saved directly to the memory
card. Settings such as white balance and contrast can be adjusted on a
computer after shooting.
JPEG fine
JPEG
Record JPEG images at a compression ratio of roughly 1 : 4 (fine quality).
JPEG normal Record JPEG images at a compression ratio of roughly 1 : 8 (normal quality).
JPEG basic Record JPEG images at a compression ratio of roughly 1 : 16 (basic quality).
Information display P button