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Image parameters (contd.)

Color space

The EOS 30D provides the independent selection of output color space, you can select from sRGB or Adobe RGB directly from the record menu (just above the selection for Picture Style). Images taken in the Adobe RGB color space have their filename prefixed with an underscore (_) this complies with DCF 2.0 (Exif 2.21), which makes it difficult to keep images in order if you shoot a mix.

Place your mouse over the label to see a ColorChecker chart shot in the respective mode. As you can see in this comparison rather than producing an identical result using Adobe RGB mode will deliver noticeably more vivid (and likely more accurate thanks to its wider gamut) color than sRGB.

sRGB Adobe RGB (converted to sRGB)

Color space: CIE u'v' Color Distribution chart

Note that in these samples the Adobe RGB image has not been converted to sRGB and so to view it correctly you will have to load it into a color space aware photo application and assign the Adobe RGB color space. Below each sample is the CIE u'v' Color Distribution chart; larger gray triangle approximately represents the range of color which the human eye can resolve, the inner triangle the available gamut in each color space (sRGB or Adobe RGB).

sRGB Adobe RGB

Sharpness

As you can see the sharpness setting of zero (0) really means 'no sharpening at all', believe it or not this is the image the sensor captures, soft thanks to the anti-alias filter. The EOS 30D needs a little more sharpening than the EOS 5D, hence a setting of level 3 is probably the best compromise (with potential sharpening artifacts) to deliver the best detail. Level 2 is good for situations where you need a fairly conservative image for post-processing. The Neutral Picture Style was used for the samples below.

Sharpness: 0 (Neutral & Faithful default) Sharpness: 1
Sharpness: 2 (Portrait default) Sharpness: 3 (Standard default)
Sharpness: 4 (Landscape default) Sharpness: 5
Sharpness: 6 Sharpness: 7

Contrast adjustment

Adjusting the tone alters the shape of the 'S curve' used to map the linear image data captured by the sensor into the correct gamma. A lower contrast setting maintains more of the original data's dynamic range but leads to a flatter looking image. A higher contrast setting stretches the grayscale (dark to light) of the image and could lead to clipping of both shadow detail and highlights. The Neutral Picture Style was used for the samples below.

  Contrast Luminosity histogram
-4

-2

0

+2

+4

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Comments

RVer
By RVer (6 months ago)

The 30D had a 50 mm lens and the 5D had an 85mm lens and that could account for the difference in reading the globe etc.

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