Canon EOS-1D Dicas e técnicas - Página 25

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The Level 10 setting for JPEG quality produces the highest image quality level for

in-camera JPEGs, while Level 1 yields the highest compression ratio. The higher the

compression ratio, the greater the potential for image quality degradation, and vice

versa. Therefore, when preservation of fine detail is important, we recommend shooting

RAW files or high-quality JPEGs. The camera's default setting for JPEG quality is more

than adequate for most applications, but we suggest that you try some of the other

settings to determine your "comfort level."

Another aspect of selecting JPEG quality settings is their effect on the maximum number

of shots that can be taken in a continuous burst. With the Mark II cameras in particular,

buffer performance improves substantially at lower JPEG quality settings due to smaller

file sizes.

In-Camera Sharpness,

EOS-1 class digital SLRs have additional image quality settings including sharpness,

Contrast, Saturation &

contrast, saturation and color tone, which can be applied to all images. In the case of

Color Tone Control

RAW files, these settings can be overridden in post-processing. However, it is very

important to understand that sharpness settings in particular can have a significant

effect on the appearance of in-camera JPEGs, i.e., images that are shot as JPEGs in the

camera as opposed to RAW files that have been converted to JPEGs in your computer.

Before getting into a detailed discussion of sharpening in-camera or on a computer, it's

important to realize that pictures taken on overcast days or taken indoors with only

natural light look softer than pictures taken on sunny days or indoors with direct flash.

Why? Because overcast day/indoor natural light pictures have less contrast than the

sunny day/direct flash pictures, and pictures with less contrast look softer than

pictures with more contrast. Knowing that, the contrast of a somewhat softer image can

be boosted in-camera or in an image-editing program, giving the appearance of a

sharper picture.

Speaking of soft images, lens flare can cause even a picture taken on a sunny day to

look soft. Another cause of an apparently soft image (or more commonly a soft area of a

picture in this case) is over-saturation. When an image or image area is over-saturated,

it loses detail and looks soft. This can often be corrected by reducing the saturation

in-camera or in an image-editing program.

Sharpness: To satisfy a wide range of photographers, EOS Digital SLRs vary significantly

in terms of range and default settings for sharpness, which is more correctly referred to

as in-camera sharpening. Entry-level and advanced amateur models such as the EOS

Digital Rebel, 10D and 20D use a 5-step sharpness scale from -2 to +2, with default

settings typically at 0 (mid-scale) or +1. This is a noticeably higher level of in-camera

sharpening than the default settings for EOS-1 class Digital SLRs, and may cause some

concern for photographers who use both cameras. On the other hand, the default

setting for sharpness level on EOS-1 class Digital SLRs is 0 on a scale from 0 to 5. This

lack of in-camera sharpening was intentionally chosen by Canon to preserve as much

III. IMAGE QUALITY SETTINGS