**ShowPlay Reference Manual, Chapter 1 (Introduction): Images**
===== Manipulating how images are displayed in a real-time paradigm =====

You can modify the display of image stimuli in a ShowPlay paradigm by changing the values of the display control variables.  Some of these can be changed interactively using the **Display** menu.

**Display control variables:**
  * flipflag - 0=default, 1=horizontal flip, 2=vertical flip, 3=flip both
  * widscale - horizontal size scale factor (default=1.0)
  * hgtscale - vertical size scale factor (default=1.0)
  * rgbscale - color brightness scale factor (default=1.0)

Note: These display control variables only work properly if your stimuli are images (i.e., JPEG or PCX files). They are applied when the images are pre-loaded just before running the paradigm. Explicit text stimuli and videos do not get pre-loaded so these display control variables do not currently work for such stimuli.  If you need to flip or scale text stimuli you should first save each stimulus as a JPEG image.

**See Also:**\\
[[jvs:cigal:showplay:manual:tutorial|ShowPlay Tutorial]], 
[[jvs:cigal:showplay|ShowPlay Home]], 
[[jvs:cigal:showplay:manual|ShowPlay Manual]],
[[jvs:cigal|CIGAL Home]], 
[[jvs:cigal:manual|CIGAL Manual]],