brightness
Refers to the brightness level of light impinging on the scene or image, if the image is gray, the gray values associated with the gray value the higher the brighter the image.
Contrast
It refers to the difference between the images in different colors at the brightest and the darkest, the larger the difference the higher the contrast, in general, the greater the contrast, the sharper the image eye-catching, bright colors are more vivid
saturation
Refers to the degree of bright colors, the more color-containing component, the greater the degree of saturation, more vivid colors, divided by the brightness contrast is defined as
grayscale value
Range of values 0-255, gray image, the gradation value 0 represents black and 255 represents white, i.e. 0-255 black - gray - degree of white transition
RGB
Each color image element (pixel) is an RGB value, RGB components of each of one byte, a total of three bytes.
Bit Depth
Bit depth is the number of channels into bits, e.g. RGB image has three RGB channels, then the corresponding bit depth is 3 × 8 = 24
Pixels
Means non-subdivided image, each image is constituted by a great many pixels, which is a single color, the presence of small cells, with a grayscale byte capacity to store a pixel, the true 24 RGB three color bytes are used to store a pixel
Resolution
Resolution horizontal resolution and vertical resolution horizontal resolution refers to an image in the horizontal direction, a total number of pixels, the vertical resolution indicates the vertical direction, for example, our common the 1920 × 1080 resolution, said level a total of 1920 pixels in the direction, vertical direction 1,080 pixels, the whole image there are 1920 × 1080 = 2073600 pixels points (note that the pixels are different size images are not necessarily the same)
DPI
Share of the number of pixels per inch
bitmap
A bitmap is composed of a plurality of pixels, digital camera photos, the scanner images and computer screenshots, etc. are all bitmap
RGB bitmap
RGB is a color bitmap encoding method, red, green, and blue optical intensity to represent a color, it can be used directly for the screen display
CMKY bitmap
CMKY bit is an encoding method of FIG colors, with cyan, magenta, yellow, cyan, and black to represent a color pigment content, color printing can be used directly
Alpha Channel
It is an 8-bit gray channel which is recorded with a 256 gray scale image is the degree of transparency, 0 represents a fully transparent, opaque 255, i.e. 0-255 transparent - translucent - degree of opacity transition, similar to Gray of the image, i.e. 0-255 black - gray - degree of white transition
Image data
For real-world images are generally represented by the light intensity and the spectrum of each point on the image, when converting the image information into data, shall image is decomposed into many small area, the small area pixel is mentioned above, it can then be represented by a gray scale value, used for true color image of red, green and blue (RGB) components of three primary colors represented. Sequentially extracting information for each pixel, can be used as a discrete matrix representing an image of a continuous
Image matrix
The digital image data may be represented by a matrix, the matrix and thus the matrix theory algorithms can be used for digital image analysis and processing, the image data is usually stored two-dimensional array
Device Context (DC)
DC is a data structure that contains the Windows drawing information of a device (such as a display printer), all drawing calls are performed by the device context object, which object encapsulates DC for drawing lines, shapes, text, and the Windows API
HDC
The MFC device context handle
HBITMAP
HBITMAP handle bitmap is a bitmap pointer, the BITMAP is a structure that encapsulates some information about the bitmap, the bitmap is defined height, width, color format and bit values