Some of the color Openlab datasets we have encountered store images in a rather interesting fashion. First, there are three single-channel images in a row—a red channel, a green channel, and a blue channel—each with values ranging from 0 to 4,095. This data is probably the originally collected data, stored in full 12-bit depth (for a total of 36 bits per image). For some reason, the file then contains one color image of the same information at 24-bit resolution (each of R, G and B ranging from 0 to 255).

This discrepancy in color ranges makes VisBio's color mapping job difficult. Fortunately, there is an easy way to avoid this issue altogether, using VisBio's subsampling ability.

What you probably want is to visualize just the full-color images. Remember that the image ordering inside the file is RGBC,RGBC,RGBC (red, green, blue, full-color; etc.). You want a data object containing only every fourth channel, starting with image #4.

After importing your dataset, click Add > Subsampling. Choose a name, then click the Edit button to alter its parameters. Change the starting image for the appropriate dimension from 1 to 4, and change the step from 1 to 4. Click Apply, map the sampling to one of VisBio's displays, and you're set!