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  Indian J Med Microbiol
 

Figure 4: The Point-of-Use Quality Assurance tool interface. The user is presented with four target letters (for example, Y, R, H, and N), with background colors selected using a predetermined linear H and E color range: dark, mid, and light. The foreground text color is set to 1 dE in distance away from the background color (with a ± 0.005 tolerance), along the same linear color space. The direction of the delta E is set for each box such that: (1) dark+ 1 dE, (2) mid −1 dE, (3) mid +1 dE, and (4) light −1 dE. dE: Delta E

Figure 4:  The Point-of-Use Quality Assurance tool interface. The user is presented with four target letters (for example, Y, R, H, and N), with background colors selected using a predetermined linear H and E color range: dark, mid, and light. The foreground text color is set to 1 dE in distance away from the background color (with a ± 0.005 tolerance), along the same linear color space. The direction of the delta E is set for each box such that: (1) dark+ 1 dE, (2) mid −1 dE, (3) mid +1 dE, and (4) light −1 dE. dE: Delta E