Thursday 4 November 2010
OCA Course: Colour - Primary and secondary colours.
Primary and Secondary Colours: As I live in a very rural area, most of the colours I see relate to vegetation rather than man-made structures, so these images are local to the surrounding countryside, village or garden. Despite it being near the end of the flowering period, there was still plenty of early autumn colour. I cheated with the exposure variations in this series, as I modified the exposure "in computer", using Adobe Lightroom to vary the camera exposure by half a stop either way. I don't think the end result is much different.
1. Violet: Cyclamen. EOS 10D, 150mm macro lens, tripod.
Underexposed half a stop. (Despite owning newer DSLR's, I still like the 10D. It produces nice colour from it's 6 megapixel sensor because the photosites are relatively large - images are OK up to A3).
2. Correct exposure.
3. Overexposed half a stop.
4. Blue: Meadow Cranesbill: Canon S90 compact digital in macro mode. Underexposed half a stop. The increased saturation helps here.
5. Correct exposure.
6. Over-exposed half a stop. A bit washed-out.
7. Green: Convolvulus - yes I know the flower is white, but the leaves are green. and show some nice lines in the composition. Underexposed half a stop. Detail in the flower is better. EOS 1D Mk111 with 50mm macro lens.
8. Correct exposure.
9. Half a stop over- the flower is burning out.
10. Yellow: Rowan berries (yellow strain)- underexposed half a stop. EOS 10D, 150mm macro lens.
11. Correct exposure.
12. Half a stop overexposure - Perhaps enhances the succulent appearance of the berries.
13. Orange: Whitebeam berries - underexposed half a stop. Probably a bit dull. EOS 10D, 150mm macro lens.
14. Correct exposure.
15. Half a stop over exposure - the orange is more prominent.
16. Red: Virginia Creeper. This house in the village is covered in it (see previous posts). EOS 1D Mk111, 17-40mm zoom @ 17mm. Underexposure by half a stop renders the red too dark, probably because of additional underexposure caused by the bright sky.
17. Correct exposure, but still a little too dark.
18. Overexposure by half a stop - produces a correct rendition of the red creeper. I should have compensated by a stop or so when taking the shot originally.
Conclusion: There is probably no such thing as correct exposure, and modern digital image processing software programmes allow more experimentation to get a pleasing result without burning up expensive film. From this limited series, it seems slight overexposure benefits the reds, yellows and oranges, but slight underexposure benefits the blues and violets.
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