File:Nearsighted color fringing -9.5 diopter - Canon PowerShot A640 thru glasses - closeup detail.jpg
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[edit]DescriptionNearsighted color fringing -9.5 diopter - Canon PowerShot A640 thru glasses - closeup detail.jpg |
English: Cropped close-up example from File:Nearsighted color fringing -9.5 diopter - Canon PowerShot A640 thru glasses - overview.jpg
See also: Example of how extremely nearsighted people experience color fringing and distortions if not looking directly through the center of their glasses. This was created by setting the manual zoom on a Canon PowerShot A640 to be nearsighted, then pointing the camera through the eyeglasses turned backwards to correct the intentional myopia of the camera lens. Through the sides of the lens, the colors are prismatically shifted and distorted, resulting in seeing color fringing that does not exist. These color fringes make accurate and precision drawing and painting difficult for a person wearing glasses. Several color-box positioning mistakes were made while trying to create the example image for this demonstration. Only zooming in at high detail to enlarge edges is sufficient for dealing with these optical color errors. Extreme nearsighted users of contact lenses do not see these color fringes because the contact lens moves with the cornea and color rendering is always done through the center of the contact lens. (Presumably, optical materials of lower index can result in better color rendering, however I have been unable to find a source for pure glass eyeglass lens to verify this claim.) |
Source | Own work |
Author | DMahalko, Dale Mahalko, Gilman, WI, USA -- Email: dmahalko@gmail.com |
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current | 05:17, 14 October 2009 | 1,460 × 1,168 (309 KB) | DMahalko (talk | contribs) | {{Information |Description={{en|1=Cropped close-up example from File:Nearsighted color fringing -9.5 diopter - Canon PowerShot A640 thru glasses - overview.jpg Test image used to create: [[:File:Nearsighted color fringing -9.5 diopter - source image |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot A640 |
Exposure time | 4/5 sec (0.8) |
F-number | f/8 |
Date and time of data generation | 23:38, 13 October 2009 |
Lens focal length | 7.3 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 5.0 Windows |
File change date and time | 00:15, 14 October 2009 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 23:38, 13 October 2009 |
Image compression mode | 5 |
APEX shutter speed | 0.3125 |
APEX aperture | 6 |
APEX exposure bias | 0 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Center weighted average |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Focal plane X resolution | 12,710.801393728 |
Focal plane Y resolution | 12,725.581395349 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Manual white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |