Difference between revisions of "UM:Warper Warper Basics"

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Revision as of 11:07, 15 October 2014

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Warper Basics

Both Warp 4 and Warp 9 warpers share common features.

 

A warp is created by selecting and moving one or more control points. These can be manipulated and controlled interactively using the mouse or the GUI controls.

 

dv_note

Owners of a Precision Panel can also use it to control the warper tools.

Control Points

Control points are placed around the edges of the source image.

 

ch-warper-controlpoint-w4

ch-warper-controlpoint-w9

Warp 4 : four warper control points.

Warp 9 : nine warper control points, including the central control point.

 

Control points change their look when used :

 

ch-warper-controlpoint1

An unselected control point.

ch-warper-controlpoint2

A selected control point

ch-warper-controlpoint3

A control point with a mouse cursor proximity indication.

Mouse Control

ch-warper-controlpoint-indicator

 

A control point is indicated in red when your mouse cursor is within range.

 

To select points :

 

Select one control point :

Click it with the left mouse button

 </br></br>
Select multiple control points :

Hold down the SHIFT key while click selecting points with the left mouse button

 </br></br>
Hold down left mouse button and drag to warp image

Marquee Select

You can marquee select multiple control points by drag selecting them :

 

ch-warper-marquee-select

Drag select multiple points using the mouse.

GUI Controls

Once selected, you can manipulate control points via the GUI controls, using the mouse or keyboard to enter value.

 

ch-warper-controlpoint-gui

The Warp 4 GUI controls

 

The Warp 4 GUI controls are shown above, and include separate sliders for the X/Y movement of each Warp 4 control point. Four points leading to eight sliders.

 

The Warp 9 GUI controls are similar but have eighteen sliders corresponding to X/Y for all nine control points.

Warp 9-as-4

You can make the Warp 9 tool warp in a similar mode to Warp 4 by selecting a corner point and dragging whilst holding down the ALT key :

 

Mouse drag top-right point :

 

ch-warper-warp9-normal

Normal Warp 9 single point drag and warp behaviour.

+ ALT :

 

ch-warper-warp9-as-Warp4

Warp 9 warp behaviour with ALT held down.

 

Note that the warper behaves in a similar way to Warp 4 and as if the mid-points do not exist. The central point stays locked in place however.

 

dv_note

The Precision Panel has a 4 Points toggle to enable this mode. In effect, the Warp 9 tool changes to a Warp 4 :

 

ch-warper-warp9-as-Warp4-precision

 

Frame Violation

For frame violation issues, the Precision Panel has mode that lets you modify all left points in X, all right points in X, all top points in X etc.

 

Use the Left, Top, Right, Bottom buttons to select the row of affected control points
Then move all the selected points in the X or Y  axes using the All Left X or All Left Y, or All Top X, All Top Y etc.

 

ch-warper-warp9-all-left-x-precision

 

Using Left / All Left X to select and move only one side of the image in the X axis.

ch-warper-warp9-all-left-x

Basic Controls

Scale

ch-warper-scale

 

Values :

0 - >100000 (slider)

Default :

1.000

 

The Scale slider lets you scale the image from image center.

 

dv_note

You may want to hide warper boundary artifacts in some circumstances and the Scale control can push these outside the visible frame.

Channels

ch-warper-channels

 

Values :

RGB , R , G , B

Default :

RGB

 

You can choose to warp only a single RGB channel or (by default) all three.

 

dv_note

This can be useful for cases (e.g. stereoscopic sequences) that have distortion that differs in one or more colour channels.

Reset Selected Points

ch-warper-reset

 

This button will reset any selected control points.

 

dv_alert

This also removes any keyframes associated with the control points.

Warp 9 Extended Controls

Interpolation

ch-warper-interpolation

 

Values :

Linear , Bicubic

Default :

Linear

 

Linear interpolation is faster but less accurate than Bicubic.

Center Pinning

ch-warper-center-pin

 

Pinning the central control point stops it moving when manipulating other control points and so protects the central part of the image.

 

Use the Pin Radius to hold a proportion of the central image area steady as you move other control points around.

 

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