|
|
|
|
|
inCamera includes an optional step that allows you to evaluate aspects of the quality of your chart image that could impact the usefulness of the resulting profile. To use this feature, you must first select your chart type, data reference file (including light source, if possible with your reference file), and position the chart template, as described in the preceeding sections of this user guide. Then, click on the Check Capture button:
Depending on the resolution of your image, there may be a noticable delay as the image is analyzed. When the analysis is complete, a summary of the results will be displayed numerically and graphically. You can switch from one view to another with the Overlay pop-up menu:
The Noise panel and overlays provide information about how much noise was found in the chart portion of the image:
Color coded dots appear in the center of each patch in the chart. The lower half of the Noise panel defines the color coding. In the upper half of the panel, the Overall noise for each channel of the image (red, green and blue) is reported, expressed in the same standard deviation units that the Adobe Photoshop histogram uses. These values represent the average for all of the patches in the chart. The Worst noise found in any patch is also reported. To help you quickly locate the patch where the worst noise was detected, it is outlined with a dotted line in the corresponding overlay.
If these values are high, you may want to consider applying a noise removal filter (such as Adobe Photoshop's Smart Blur) to your images before applying your profile. Otherwise, you may find that although the profile corrects the average color of an area, it also accentuates the noise.
Additional information about Lighting Uniformity will be displayed if you are using the ColorChecker SG or the ColorChecker DC chart:
This information can help you determine how uniform the lighting was when the chart was photographed. Each patch in the chart is color coded according to how much the lighting at that patch differed from the lighting at the center of the chart. As the lower half of the information panel indicates, darker patches are represented with shades of blue and lighter patches are represented with shades of red. A perfectly illuminated chart would show all patches as white.
The Overall uniformity error is an overall measure of lighting uniformity with respect to the center of the chart. A perfectly illuminated chart would have an overall error of 0.0%, and any lighting imperfections (either lighter or darker) will increase this value. If the overall error is high, you should consider photographing the chart again under more uniform lighting.
If the lighting for any of the patches was darker than the lighting at the center of the chart, information about the Darkest lit patch is displayed. Likewise, if the lighting for any patch was lighter than the center, information about the Lightest lit patch is displayed. To help you quickly locate these patches, they appear outlined with a dotted line in the Uniformity overlay. This information may help you determine what kind of corrections to make to the lighting before photographing the chart again.
|
|
|
|
|