Quantum Data 881 - Manual (Page 227)

881/882 Video Test Generator User Guide (Rev A.22) 209
Setting image component values
You can increment the color component values or can decrement the color component
values for all pixels of any image through the front panel or the command line. This feature
enables you to increment or decrement the values in increments (or decrements) of 1, 10
or 100 throughout a range of 0 to 255 through the front panel or by any increment 1 or
greater through the command line. The LEVP feature increments or decrements all color
component values (R,G,B) for each action by the user either through the command line or
through the front panel.
You can also increment the R, G, B color component values individually through the
command line in increments of 1 or greater using the
LEVP:R command. And you can use
the LEVP:R and LEVP commands together.
Note: These commands are best used with component color formats (RGB color scheme).
The color mode is set by the AVST or DVST command. AVST 2 is analog RGB color mode;
DVST 10 is digital RGB color mode. If you have a format and configuration with color
difference (YPbPr or YCbCr) you see a reduction or increase of the chrominance difference
values but the Y component values will remain. Therefore as your reduce the color
component values for red, green and blue you will see a pronounced green image.
This subsection describes these procedures.
To increment or decrement all color component values for an image:
1. Select an image by pressing the Content key.
2. Press the Options key repeatedly to access the component increment menu. The
following menu appears on the generator’s display:
3. Set the increment value to either 001, 010 or 100 by pressing the soft key adjacent to
the Inc:001 item on the menu.
4. Increment or decrement the image color component values by pressing the + and -
keys.
To increment or decrement all color component values for an image through the
command line:
1. Select any image you want to modify by pressing the Content key.
Alternatively you can enter the following command:
IMGL SMPTEBar // Loads the SMPTEbar test image
IMGU // Renders the test image that is loaded
2. Enter the following commands to set the color component values:
Inc:001 LEVP:225