small clarification

[goodguy/cin-manual-latex.git] / parts / Windows.tex

diff --git a/parts/Windows.tex b/parts/Windows.tex
index 760a69601ed98a7a7e6b384bd7f2aed42368dbf4..6bbea8b9c933c3b622afcb06349ee4106a1b0b47 100644 (file)
--- a/parts/Windows.tex
+++ b/parts/Windows.tex
@@ -1100,6 +1100,8 @@ The compositing pipeline graph has a masking stage (figure~\ref{fig:temporary-02
 
 The Mask popup menu can be overwhelming upon first encounter.  However, if you follow the next
 few steps you can create a single simple mask without having to understand every possible parameter.
+Be sure you are working in a Format that includes the Alpha channel, YUVA or RGBA, because you need
+to have transparency for masking to show or will end up with only a black area.
 \begin{enumerate}
     \item To define a mask, in the Compositor window click on the \textit{Edit mask} icon to get the popup Mask menu.  If the menu does not come up, click on the \textit{Show tool info}.
     \item  On the video, LMB click on the place where you want to start a mask.
@@ -1922,7 +1924,7 @@ The reason for playing 5 seconds of a video for a vicon is that until the first
 In other words, a lot of media does not begin at the \textit{beginning} point and will not be properly rendered until enough data has been read to assemble a picture.  
 You can increase the thumbnail size, clarity of pixels (memory size) and color mode but it takes a lot more memory.  
 Change these values in \texttt{Settings $\rightarrow$ Preferences}, Appearance tab, right hand side of the Layout section -- be aware that when you click OK, your session will re-initialize.  
-You can also temporarily increase the preview mini-window by use of the mouse wheel up or down.
+You can also temporarily increase the preview mini-window by use of the mouse wheel up or down for media but not for clips.
 
 There are 4 options for the preview mode.