Forgotten in its old age

by Aditya

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Looking at an eBay auction description, your Kako 720sd specs out with a guide number of 28-40m (I'm assuming that's across the zoom range of 28-85mm), so chances are that this is a pretty decently-powered speedlight (e.g., in the neighborhood of 30m when zoomed to 35mm), in the range of most of the hotshoe flashes you're going to find. Going to a new ...


Each pixel is composed of three colors: red, green and blue. An image with a color depth of 8-bit has 2^8 distinct values per color channel. This value represents brightness. If the brightness is set to zero than it represents black. If the value is set to 256 for red than it means red elicits color at maximum power. In other words, brightness is the value ...


When you say "light blue" is lighter than "dark blue" you may be mixing two concepts together without knowing it. In one sense, the colors light blue and dark blue are two different colors - that is, they are a different proportion of the three primary colors. You could also be talking about different brightness levels within the same proportion of color ...


The unit of measure for brightness is the lumen. I know it is used to measure the amount of light emmited from a source. But in your question, I think you are talking about the reflection of light off a source. I may be wrong but I think it is also measured in lumens. The presence of black (in your example of dark vs light blue) shows lower lumen units ...

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