Color Accuracy Test — Gray Ramp, Gamma & Near-Black/White Check
Visually check your monitor's color accuracy with gray ramp, RGB gradient, gamma test, and shadow/highlight identification.
#1Gray Ramp
16 steps from 0 (black) to 255 (white). Check if all steps are smoothly distinguishable.
0
17
34
51
68
85
102
119
136
153
170
187
204
221
238
255
#2RGB Color Ramp
0-255 gradient for each Red, Green, and Blue channel. Check each color's smooth transition.
Red
0
17
34
51
68
85
102
119
136
153
170
187
204
221
238
255
Green
0
17
34
51
68
85
102
119
136
153
170
187
204
221
238
255
Blue
0
17
34
51
68
85
102
119
136
153
170
187
204
221
238
255
#3Gamma Test
Compare the stripe pattern brightness with the 50% gray patch to check your monitor's gamma.
Stripe Pattern
50% Gray
When gamma is correctly set, the stripe pattern and the 50% gray patch should appear equally bright. If the stripes look brighter, your gamma may be too low. If darker, it may be too high.
#4Near-Black Identification
Very dark patches (values 1-10) on a black background. Check if you can distinguish all of them.
If you can distinguish all patches below, your monitor's shadow detail is good. Patches that blend into the black background indicate crushed blacks.
1
2
3
4
5
6
7
8
9
10
#5Near-White Identification
Very bright patches (values 245-254) on a white background. Check if you can distinguish all of them.
If you can distinguish all patches below, your monitor handles highlights well. Patches that blend into the white background indicate clipped highlights.
245
246
247
248
249
250
251
252
253
254
How to Use This Test
This test provides a quick visual check of your monitor's color accuracy. For precise calibration, a hardware colorimeter (e.g., i1 Display Pro) is recommended. Use this browser-based test as a reference when adjusting monitor settings (brightness, contrast, gamma).