Forum: Pentax DSLR Discussion
08-04-2010, 08:10 PM
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I use AF only when I can control the environment and be confident the focal point isn't going to move too much, otherwise it's just annoying. Case in point:
Last weekend was spent with extended family. I whipped out the K10D to catch a few quick shots of my kids playing around on go-carts. I made the crucial mistake of leaving the lens on AF mode and consequently lost some brilliant moments while my lens jumped back and forward trying to focus on my moving subjects. Later, I put it back to manual, pulled up the ISO and decreased the aperture to extend DOF. Got some nice action shots that way instead.
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Forum: Digital Processing, Software, and Printing
06-15-2010, 08:30 PM
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I haven't read all posts in this thread, so apologies of repeating thing:
A lot of discrepancy in colour matching between screen and print has to do with the RGB to CMYK conversion. This is especially noticeable if you've enhanced the colours in the Green/Blue space onscreen (The more vivid you make the green/blue tones, the more trouble the printer has matching those tones, often resulting in the tones looking more pink or yellow). The problem is there is no true green or blue ink in printers. Only cyan, magenta, yellow and black. And while magenta and yellow can mix well to create true red, orange and yellow tones, there are no two ink colours that will produce a vivid blue tone. Cyan is the closest thing to blue, but it already contains yellow.
The "cheat" is to convert your RGB image to a CMYK image onscreen if possible (you can do it in Photoshop) and enhance it from there. Colours will adjust within the boundaries of CMYK gamuts, so the screen will show a more accurate representation of how the print will look. Once you've finished editing, convert it back to RGB.
If you can't convert between CMYK and RGB, then see if your program has a gamut-warning setting. This will let you know if your enhancements have pulled the colours past the CMYK gamut as you edit.
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