Getpixel equivalent in Processing

srinag

Getpixel returns the color of the pixel in c++. Is there an equivalent in Processing..? if not is there any mechanism to get pixel details? Thankyou in adv!

quark

the get(x,y) method will get the pixel color from the position [x,y]

GoToLoop

• get() w/ 2 coordinate parameters: https://processing.org/reference/get_.html
• pixels[] array: https://processing.org/reference/pixels.html

srinag

Thankx quark and GoToLoop! this was the quickest reply i ever got to my question! thanks a lot!

PhiLho

"Getpixel returns the color of the pixel in c++"
Although the intent of the function is clear, I doubt there is such function in standard C++. You can find it tied to some OS (Windows / Linux / MacOS) and / or some graphical manager (Gtk+ / KDE, etc.) or library (Qt / Cairo / etc.).

srinag

i tried pixel[]... what exactly does it contain? int or a variable of type color?

quark

Pixel [] is an array of int elments each pixel/int is 4 bytes long so 32 bits

These are used to create four 8-bit 'channels'

Alpha A bits 24-31

Red R bits 16-23

Green bits 8 -15

Blue bits 0-7

Thia colour scheme is refered to ARGB

Alpha is level of transparency / opaqueness

Google should give you more detailed info on 32 bit ARGB

srinag

i thought int was 2byte! can i extract R,G and B values?

GoToLoop

short & char are 2 bytes (16 bits). Read about color datatype:
https://processing.org/reference/color_datatype.html

srinag

Got it! done! thnakx!

asimes

You can get the individual channels with bitmasks following the formatting quark mentioned. For example, to get red you could do this:

int red = pixels[i]&0xff0000;