Colors->Threshold Changes all the colors on the active layer (or selection) to B&W only - allowing you to choose which lightness level represents the threshold from black to white (and even with a further option to "wrap" lighter colors back to black). This will change the image (all layers), and confine the color model to use to the 1bit palette - modify it back to RGB color model ( Image->Mode->RGB) if you plan to continue editing the image. Image->Mode->Indexed mode and pick "1 bit palette" - you can opt to enable dithering bellow, on the same dialog before applying the effect. To reduce it to Black and white, there are a few other possible tricks: So, these are the ways to reduce an image to "Grayscale". (This filter has moved to Colors->Desaturate on GIMP 2.9) This is just amazing - it calculates pixel values based on local grayscale levels. and pick C2G on the drop down filter list. The most beautiful grayscale effect is hidden on GIMP 2.8: Use Tools->Gegl operation. As mentioned above, just go to Image->Mode->Grayscale (which changes the working colorspace for all layers). Colors->Filter Pack - select the "saturation" on the "windows" column, and just click repeatedly on Less sat before applying. Colors->Colorify, picking white for the target color. If the current gradient is grayscale (or even pure black and white), you get the grayscale image - again with a different way to control the outcome Colors->Map->Gradient maps an image to the active gradient. Separate each of the color channels on the image - with an optional interpretation of the color image as "CMYK" or "HSL" besides "RGB" into a separate, grayscale, image (or layer). If you check the "monochrome" box, the target image is grayscale - this allows a lot of control on the resulting image allow you to compose channel values on the resulting from a percentage of each component on the source image. This is GIMP 2.8 - Unstable GIMP 2.9 has even more algorithms to desaturate. Colors->Desaturate which offers 3 different algorithms to generate a gray value from given colors (the options above allow a lot of control on the grey levels, since you can slide the Luminosity control as well. 
Colors->colorize.and again, pull the `Saturation control to the leftmost position. BLACK AND WHITE 1 BIT FULL
and pull the Saturation control full to the left
To simply reduce saturation of the current layer to gray levels, and continue editing the image in the RGB color space, there are several options: To do that, go to Image->Mode->Grayscale - just as suggested on the other answer.
There are several ways of doing it in GIMP, and it depends on the end-result you want.įrom your question, one can't know if your desired result is really a "black and white" (only) image, or a desaturated image, with up to 256 shades of gray.Īlso, you have options to either desaturate only the active layer or selected region, and continue editing the image in the RGB color model, or convert the image grayscale colorspace - which will convert all layers, regardless of selection, and automatically cast any colors to gray on painting.
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