Category Archives: Part 2: Digital image qualities

bricks, glass and metal in the City

I’ve been chasing images for an assignment in London this weekend, getting alternately baked and soaked, but having a lot of fun. I’ve been pondering the nature of architecture in London and the City in particular, where normal planning rules … Continue reading

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Exercise: Colour cast and white balance

Auto setting is close, but the daylight setting is closest to the actual tones. The building is not as creamy white as interpreted by the cloudy setting. The daylight setting seems to have a blue cast, and while the auto … Continue reading

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Exercise: Highlight clipping

This is the whole scene with no highlight clipping, and I found that there were differences between the pre-capture histogram, which was showing very slight clipping, the post-capture clipping display, and then the histogram within Photoshop. I picked out a … Continue reading

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Exercise: Your camera’s dynamic range

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The highlight section of the image that I used to set the exposure where clipping was removed is the bright white card.  I did so by reading the camera histogram, but also by checking the “clipping blink” warning. This is … Continue reading

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Exercise: Your tolerance for noise

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I shot at a range of ISO settings from 100 to 3200 but it seemed useful only to show only the extremes.  These are the full scenes and at this web resolution there isn’t much difference although you can identify … Continue reading

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Exercise: Sensor linear capture

Histogram clearly illustrates the characteristics of linear capture. Most light is captured at the dark end of the scale which implies those photosites will fill up quickly while the photosites at the light end of the scale take more photons … Continue reading

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