DVDO iScan Guide de l'utilisateur télécharger pdf (Page 33)

DVDO iScan Mini - 4K Scaler / Video Enhancement

DVDO iScan Mini 33

Grey Ramp

The ‘Gray Ramp’ can help verify that your display is showing the

gradients between black and white correctly. You should see a

smooth transition between black and white with this test pattern.

This test pattern is a horizontal gray ramp. There is a black level (0

IRE) vertical bar along the left of the pattern and a white level (100

IRE) vertical bar along the right side of the pattern. Between the two

bars is a monotonic gray ramp which ranges from the minimum

luminance level (i.e., blacker than black) at the left to the maximum

luminance level (i.e., whiter than white) at the right. The minimum level of the ramp is a 10-bit digital

value of 4 (equivalent to an 8-bit value of 1); the maximum level of the ramp is a 10-bit value of 1020

(equivalent to an 8-bit value of 254).

If iScan Mini is set to 8 bit color depth, and you are using YUV video, that means there are actually only

222 (238-16) luminance steps being sent to the display. The display then interpolates and smooths these

steps to attempte to display something smooth across the screen. How much banding appears on the grey

ramp gives an indication as to the video processing capabilities of your display. If the banding is

noticeable, then either using deep color (10 or 12 bits) assuming your source and content is compatible or

adding a high quality video processor like the DVDO iScan Duo is an excellent solution.

** Note: Grey ramp is only available if the output is set to YC

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DVDO iScan Guide de l'utilisateur Page 33