Black Point
The tonal level of an image where blacks begin to provide important image information, usually measured by using a histogram.
black point:
This is the color that produces color values of 0, 0, 0 for each of the RGB components when scanned or digitized. Normally, the black point is 0 percent neutral reflectance or transmittance.
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Black Point Compensation
option controls whether to adjust for differences in black points when converting colors between color spaces.
Black Point
In image editing, the tonal adjustment that sets the point at which the deepest shadow detail in the histogram is clipped to black.
Blu-ray Disc (BD) ...
black point
scanned color that produces values of 0, 0, 0 in a acanner. (Ideally, black point is 0% neutral reflectance or transmittance), also refer to white point.
Black point compensation
A setting in Photoshop that adjusts for differences in black points when converting colours.
Black Point: The tonal point at which solid black occurs. Tonally speaking, the black point occurs just below the shadow values.
Check the black point color balance.
This is the easy one. It's usually very easy to detect a color cast in the shadows. In most cases, Auto-Levels will have already fixed this for you.
The white and black points determine where clipping will occur. Some value different from 0 gives a more natural look.
Keep experimenting! ...
The checkbox underneath the RGB profile to "Use black point compensation" similarly sets the default for this option throughout Capture NX.
The levels tool has 3 adjustment sliders for white point, midtones and black point.
- The next section includes White Point, Black Point and Gamma. White Point affects highlights-use caution with it. Black Point adjusts the blacks in the photo-be sure they're strong enough.
25 Bring the black point arrow in to 70. Option click the black point arrow to split them, pulling one half of the arrow back to 50.
26 Bring the white point arrow in to 185.
Move the black point up to make black gray, increasing opacity. Move the white point down to make white gray, decreasing opacity. Move the black point to the white point and vice versa to invert the mask.
Blacks adjusts the tonal range by changing the black point to brighten or darken an image. The black point is where tones become pure black with no detail (0). As you adjust, watch the histogram.
you have three: For Color Handling I select Let Photoshop Determine Colors, for Printer Profile I select the specific ICC profile I'm going to use from the drop-down list, and for Rendering Intent I select Relative Colorimetric with the Black Point ...
Black point & White point (levels), -9 EV to +3.8 EV
Gamma curve
-4 to +4, Linear
Hue adjustment
-4 to +4
Saturation adjustment
-4 to +4
Sharpness
0 to 10
RGB image adjustments (also available for JPEG images) Tone curve ...
'Black Point' and 'White Point' set the high and low clipping levels in the image. Again, I tweaked them slightly from the default.
With Levels, you can change the black point, white point, and midpoint (aka gamma). With the possibility of doing this for each of the channels separately, this is often all the control you need.
We do this with the next three sets of control: White point, Black point and Gamma. White point controls the highlights, Black Point controls the shadows and Gamma controls the Midtone.
The shadows slider works like the black point slider in levels and shares the alt(opt) key trick. I’m often willing to let some shadows go black, but generally only thin lines or scattered pixels.
Next, I move on the Exposure and Black Point settings. I have a few presets I use in the Levels tool section and I try those first before manually changing the settings at each level.
Effective Pixels
Pixels on the sensor actually used to capture an image. Often, not all the pixels on a sensor can be used because: 1) some pixels on the surrounding edges of a sensor are masked off to determine a black point; or 2) some cameras, ...
the color matching diagram it is possible to plot into three-dimensional space the position of all the colors in the spectrum, having the amount of red (R), green (G) and blue (B) on the three axes respectively. The origin (O) is the black point ...
lighter tones will be overexposed and become completely white without any detail. If contrast in a scene is low, this can be adjusted later in you digital darkroom by looking at the histogram of the image and dragging the white and black point closer ...
 See also: Image, Light, Contrast, Camera, Photoshop
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