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Anchor -
Position of referent element in kernel. According to this position, element indexes for convolution are
calculated.
Autobrush -
Technique of applying automatic brushing method on image.
Background color -
Color picked from image or from color dialog box. Used for drawing and filling parts of image
after some actions.
Bit shifting -
Moving bits of color channels left or right, increasing or decreasing color value.
Brush -
An arithmetic applied to mask pixel values to obtain various shape or
free hand effects.
Channel -
A component of color vector
(R,G or B).
Circular limitation -
Technique of limiting channel color value after some action. If color value is not in interval [0,255] it is wrapped around
the interval [0,255] until it fits in.
Color vector -
Vector with three independent components or channels.
Color depth -
Number of possible colors, expressed by number of bits occupied by color vector.
Convolution -
Matrix operation with pixel neighborhood. Extremely important for image filtering.
Foreground color -
Color picked from image or from color dialog box. Used for drawing and some filtering actions.
IMA -
Image Manipulation Area. Area of Pixopedia_24 where image is rendered.
Interpolation -
Various mathematical methods of calculating value from neighbor values.
Kernel -
Matrix used for convolution and other filters. Elements have fixed values.
Luminance -
Commonly used term in image processing. Luminance is obtained by following formula:
L(r,g,b) = 0.30*r + 0.59*g + 0.11*b
MaxVal -
Highest value of all channels and its associated channel.
MidVal -
Medium value among all channels and its associated channel.
MinVal -
Lowest value of all channel and its associated channel.
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Neighborhood matrix -
Matrix used for convolution. Elements values (pixels colors) depend on scanning position.
Normal limitation -
Technique of limiting channel color value after some action. If color value is greater then 255 it is set to 255.
If color value is less then 0 it is set to 0.
ROI -
Region of interest. A part of picture masked by some shape.
Scanning -
Process of looking at each pixel of image or some ROI.
Various actions can be performed on each scanned pixel.
SwapColor limitation -
Technique of limiting channel color value after some action. If color exceeds value of 255 it is swapped to 0.
If color value is less then 0 it is swapped to 255.
Value -
Commonly used term in image processing. Value is obtained by adding maximum channel value
and minimum channel value and deviding it by 2.
Wrapping -
Techniques used in many actions and filters associated with pixel neighborhood.
When image border is encountered in process of scanning,
pixels from the opposite side of image are taken into account.
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