vo_opengl: rename prescale to prescale-luma

Since prescale now literally only affects the luma plane (and the
filters are all designed for luma-only operation either way), the option
has been renamed and the documentation updated to clarify this.

1 files changed, 4 insertions, 10 deletions

diff --git a/DOCS/man/vo.rst b/DOCS/man/vo.rst
index 58bd91cd55..9c5a2bc2c1 100644
--- a/DOCS/man/vo.rst
+++ b/DOCS/man/vo.rst
@@ -582,12 +582,10 @@ Available video output drivers are:
         better than without it) since it will extend the size to match only the
         milder of the scale factors between the axes.
 
-    ``prescale=<filter>``
-        This option provides non-convolution-based filters for upscaling. These
-        filters resize the video to multiple of the original size (all currently
-        supported prescalers can only perform image doubling in a single pass).
-        Generally another convolution based filter (the main scaler) will be
-        applied after prescaler to match the target display size.
+    ``prescale-luma=<filter>``
+        Apply additional pre-scaling (image doubling) on the luma plane
+        (if present). As the name implies, these will run before the main
+        upscaling pass.
 
         ``none``
             Disable all prescalers. This is the default.
@@ -605,10 +603,6 @@ Available video output drivers are:
             Extremely slow and requires a recent mid or high end graphics card
             to work smoothly (as of 2015).
 
-        Note that all the filters above are designed (or implemented) to process
-        luma plane only and probably won't work as intended for video in RGB
-        format.
-
     ``prescale-passes=<1..5>``
         The number of passes to apply the prescaler (defaults to be 1). Setting
         it to 2 will perform a 4x upscaling.