====== AccuColor – Color Calibration ======
AccuColor makes color-calibrated ("true color") images from multispectral images, using a color checker chart with 24 patches: 18 colors and 6 grays.

===== Modes =====
^ Mode ^ Input ^ What it does ^ More ^
| inspect | none | Outputs the XYZ values of the 24 patches that AccuColor will use | [[intermediate_level:accucolor:xyz_values|XYZ Values]] |
| record | a 1 × 24 pixel, 3-band XYZ image | Stores the XYZ values of your chart for later calibrations | [[intermediate_level:accucolor:xyz_values|XYZ Values]] |
| chart | a multiband image of the whole chart | Measures the patches and computes the calibration matrix | [[intermediate_level:accucolor:chart|Chart]] |
| input | a multiband image to calibrate | Applies the calibration matrix to make a calibrated color image | [[intermediate_level:accucolor:input|Input]] |
| individual | a multiband image that includes the whole chart | Measures the chart and calibrates the same image in one pass (Hoku 3.1) | see below |

===== Typical workflow =====
  - Check the chart values with **inspect**. If your chart has different values, store them with **record**. The values are saved, so you only need to do this once for each chart.
  - Image the color checker chart, and run AccuColor in **chart** mode on that image to compute the calibration matrix.
  - Run AccuColor in **input** mode, with that matrix, on every image from the same imaging session.

===== Individual mode =====
If an image contains a full view of the color checker chart, **individual** mode calibrates that image directly. Enter the four "roi" windows for the corners of the chart, as in [[intermediate_level:accucolor:chart|chart mode]]. AccuColor measures the chart, computes the calibration matrix and applies it to the same image. To do this, it first stores the whole image in memory.

===== Requirements =====
  * Use only visible bands, covering the visible spectrum, with more than 3 bands. Do not include infrared or ultraviolet images.
  * The images must be 8- or 16-bit unsigned integers.
  * The output is an 8-bit color image for display, with **Lab** (the default) or **RGB** "photometry".


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//Special thanks to Ken Boydston and Brian Amrine of [[https://www.mega-vision.com|MegaVision]].//