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NOTE: The Image Correction screen has been updated as of . We are in discussion with Lab Working Group on utilizing the new user interface. The main difference is that we can use colors other than the white, shades of grey and black to determine corrections. For now, continue to select the white, shades of greys and black for image correction calibrations. This user guide needs to be updated to reflect the new user interface. In progress.
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7. On opening of the Image correction window the program prompts you to select the TIFF file of the color standard you took. The image loads into both the Original and Corrected windows.
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In JPEG correction you will check and adjust, if necessary, the brightness, contrast and gamma (BCG) of the image. Situations may also arise where a JPEG correction should be applied. In the instance of very white or very dark cores, the TIFF images may look good but the JPEG images may look washed out or too dark to view details. JPEG corrections do not alter TIFF image settings. As mentioned above, with the new lights the BCG values may not need to be adjusted and to be kept at the mid values (Figure 17).
1. Click JPEG Correction Mode tab (Figure 17-1)
2. Click Applied Corrections tab (Figure17-2)3. Click JPEG Corrections tab (Figure 17-3). Adjust the Brightness, Contrast, and Gamma levels (Figure 17-4) to achieve a straight line in the Applied Corrections tab and the ROI Corrected box should RGB Corrected values in the Compare tab should have values near 242 for the white square and near 50 for the black. We want a linear relationship between the measured and given values. Each BCG setting adjusts the line in different ways and there are many different ways to adjust the values to achieve a linear relationship. You want to achieve a good image with good brightness, where the image has good saturation and not too washed out. The Applied Corrections Graph should be a straight line and the ROI Corrected Box should have values near the RGB values of 242, 242, 236. These may change depending on the instance of extreme colors, extremely white or extremely dark cores, in which the settings may have be tweaked more to get a user friendly consumer image.
Figure 14. Steps for JPEG Correction illustrated on image. 1. Select JPEG Correction Mode. 2. Select Applied Corrections tab on graph. 3. Select JPEG Correction to see Brightness, Contrast, and Gamma Corrections. 4. Adjust Brightness, Contrast, and Gamma corrections. 6. Check graph for Linear Relationship. 7. Check the boxes in the Color Checker and compare to RGB values in corrected image. (INSERT NEW FIGURE)
3. 4. If the values are good and there are no streaking issues in the images or other unwanted artifacts, you can click Save and no further adjustments are needed. However if you have determined the doesn't look good, click Cancel and you can proceed to the following section and complete the calibration instructions listed in the Calibration section below.
Figure 17. JPEG Correction using Brightness, Contrast and Gamma. It is helpful to note that with the current light set up we have not had to adjust those values to obtain a good image.
b) Calibration (JAI Camera Setup and Image Corrections)
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