Settings file used by Adobe Photoshop, an application used for creating and editing raster graphics; contains color settings for converting an image to a black and white format; contains the percentages of red, yellow, green, cyan, blue, and magenta colors to include in the resulting image, as well as hue and saturation values.

BLW presets files are commonly used for converting digital photos to black and white images. Digital photographers benefit by being able to filter various colors and create custom black and white pictures. The Black and White window in Photoshop can be opened by selecting Image → Adjustments → Black & White.... Photoshop CS5 includes the following default Black and White presets: Blue Filter Darker Green Filter High Contrast Blue Filter High Contrast Red Filter Infrared Lighter Maximum Black Maximum White Neutral Density Red Filter Yellow Filter The BLW files are stored in the /Presets/Black and White/ directory of the Photoshop installation.