(Extending this dynamic range in an image is the topic for a later tutorial). It represents the maximum dark and light that is captured for a given exposure. Locally the same definition applies, but applied across a smaller section of the image.ĭynamic range is just the overall range of values being captured in your image. Globally, it may refer to the overall distribution of lights and darks. Often a straight conversion to B&W can result in gray values that are all very similar, yielding a visually “flat” image. High contrast will have a much sharper differentiation between lighter and darker portions of an image, while low contrast will show less differences. This can be subtle, with smooth, even differences among values, or much more pronounced.Ĭontrast is the relative different in brightness between parts of an image. What I tend to refer to when using this term is the presence and relationships between different values of gray in the image. Without color, the form and tones are all that’s left. (Indeed, this is often felt to be one of the primary reasons street photography is normally associated with B&W images - with no colors to distract you, the focus is on the subjects and composition even more). This can be both liberating, and confining.īy liberating yourself of color data, you can focus much more clearly on the subjects and composition with whats left. What you want to keep in mind is that by removing the color information you have effectively left yourself with only tonal data (and composition) to convey your intentions. However, there are a few things I would like to focus on in regards to preparing your images for B&W.Īspens (no title), Ansel Adams ( © The Ansel Adams Publishing Rights Trust) B&W Conversion - Part 5 (Putting it All Together)ī&W photography deserves a much longer look than I can afford to bore you with here.B&W Conversion - Part 4 (Pseudogrey/c2g/Layers).B&W Conversion - Part 2 (Channel Mixer).The rest of the tutorials in this series are here: In this first part, I’ll look at using the GIMP Desaturate command to reduce your images to grayscale and to hopefully shed some light on just how the options calculate exactly what level of gray each pixel should be. This is a long topic, so to keep you from wanting to put your eyes out with a spoon, I’ve tried to break things up a bit. 9 min read Getting Around in GIMP - Black and White Conversion (Part 1)
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