Of course, the whole conversion can be put in a single line: Rgb565 = (((red & 0b11111000)>3)) Which formats are available depends on your compiler, I will go with binary as I think its most visual.Īfter we have masked the 5 upper bits, we need to shift redīy 8 bits to the left. The bit pattern 11111000 can be represented by 0b11111000 This is the point where we loose information, as we mask out fine shades of red. ) Only if a bit is 1 in both numbers, the result is 1, otherwise 0. Masking is done by a bitwise AND operation ( & To get ONLY the upper 5 bits, we need to mask them. Why the upper bits? Because they have the highest significance/impact on the color. In a first step, we have to shift in the upper 5 bits of red
#Pixel picker online cmyk colour code#
The code for converting a 4 byte type such as intĬan be found after this section.
Let’s assume we have 3 individual input bytes, one for each color. Note that since we have less bits (information) available, we can represent less colors. Providing 5 bits for 2 colors and 6 bits for another seems asymmetric but storing and transmitting something which cannot nicely be packed in bytes would be complicated. It provides 5 bits for Red and Blue and 6 bits for Green. RGB565 requires only 16 (5+6+5) bits/2 bytes and is commonly used with embedded screens. Moreover, storing and/or transmitting 3 bytes per pixel is consuming quite some memory and creates latency.
( read more about bit numbering)Įspecially (cheap) screens used with embedded devices do not provide 24 bit color-depth. This is a common convention, though there are also others (LSB first). If the bits on the left have the highest significance, then its called MSB (most signficant bit) first. The bits on the left have a higher significance and hence have a stronger impact on the color. In the first row I indicate the bit number and in the second row I indicate which color this bit represents and how "significant" it is. In the table below you can see how RGB888 is stored in memory. I highlighted the color each digit represents. Usually the color code is represented in hexadecimal digits (because 1 byte results in exactly 2 digits).Īn example with common notations for the color yellow (R=255,G=255,B=0) can be seen below. It defines that we have 8 bits/1 byte of information for each primary color (Red, Green, Blue) which, if added, result in the desired color.
#Pixel picker online cmyk colour how to#
There are different ways on how to represent a color but virtually all displays use RGB, where a color is represented by its Red Green and Blue components (you might have heard something about it in school, a long long time ago, if not: primary colors).Ī common representation of color information is the RGB888 (24 bit/3 byte) format. The more bits (information), the more colors we can display. The color depth defines how many bits are used to represent a color. If we want to have colored pictures, we also need information about the color. This however brings the limitation that we can only indicate if a pixel is ON or OFF (e.g. For monochrome images this is simply a single bit of information, where a prominent example are images on LCD displays such as those in old GameBoys.
If we want to store or transmit an image, we have to provide information about each individual pixel. Digital images consist out of pixels (big news huh?).
0 kommentar(er)
