User manual VIEWCAST OSPREY-240E AVSTREAM DRIVER V4.2

[. . . ] Osprey®-240e/450e User Guide AVStream Driver Version 4. 2 User Guide UL Statement, FCC Notice, Product Disposal Information Osprey-240e/450e User Guide AVStream Driver Version 4. 2 ViewCast Corporation 3701 W. Plano Parkway, Suite 300 Plano, TX 75075-7840 USA Revised 06/25/2008 © 2008 ViewCast Corporation. No part of this specification may be reproduced, transcribed, transmitted or stored in a retrieval system in any part or by any means without the express written consent of ViewCast Corporation. ViewCast Corporation reserves the right to change any products herein at any time and without notice. [. . . ] Logo files must be: In . bmp format with a . bmp filename extension. In RGB-24 format. 40 Osprey-240e/450e User Guide Chapter 2 If you have a graphic that is in another format, edit it with a drawing or photo edit program such as Windows Paint, and save it as RGB-24. Enable Keycolor Figure 2-42 You can control the key color and the transparency effect. If preview video is running, you will see your changes interactively. A "key color" is a color that disappears from the graphic so that the underlying video shows through unchanged. If the Enable Key Color checkbox is unchecked, all colors are displayed. If the checkbox is checked, key coloring is activated. You can select one of four standard colors ­ dark gray, medium gray, cyan, or magenta ­ or a custom color. It you select Other, for a custom color, the three edit boxes ­ Red, Green, Blue ­ are activated, and you can enter any color value into these boxes. Keycolors to identify transparent portions of logos can be exact or inexact. The Tolerance control (Figure 2-43) determines this. If Tolerance is 0, then all keycolors have to exactly match the Red / Green / Blue values shown in the key color control group. If Tolerance is nonzero, then the Red / Green / Blue values can deviate from the keycolor by the tolerance value and still be treated as being equal to the keycolor. For example, if Tolerance is set to 5, and the keycolor is set to grey (192, 192, 192), then pixels in the bitmap with value (187, 187, 187) will also be transparent. Figure 2-43 Weighting The degree of transparency of the logo is variable through 101 steps. If the setting is 100, the logo will be opaque. If the setting is 0, the logo will be completely transparent. If you have set a keycolor, the weighting or transparency value is applied only to pixels that do not match the keycolor and hence are always completely transparent. You can set the weighting either with the slider or by editing the number in the edit box. (Figure 2-44). 41 Osprey-240e/450e User Guide Chapter 2 Figure 2-44 Note that the SimulStream Eval logo is a special case ­ it is restricted to the range 50 to 100 so that it cannot be made completely transparent Figure 2-46 Logo Position and Size The Logo Position and Size sub-tab lets you position and scale the logo. It is strongly recommended that you have preview video running when you use these controls. The large indented rectangular area at the top of this sub-tab represents the video area where the logo can be positioned. The smaller rectangle represents the logo. To position the logo, click on the logo rectangle and drag it to the new position. [. . . ] Go into the Video Standard field of the Control Dialog's Source page, and click the button for that signal format. Poor Video Quality at Large Frame Sizes Large frame sizes with the deep pixel depth (24- or 32-bit), or complex format (YVU9 or YUV12 planar), impose heavy demands on the PCI bus's data transfer capacity. Our experience is that some systems cannot handle these formats at full frame sizes. Systems vary in their data transfer limits. The characteristics of the PCI bridge are often more important than processor speed. [. . . ]