Shudder

Shudder/blur effects.

The shudder filter started off as a blur filter. Yes, you can still create blurry effects but the effect turned more into a camera shudder effect. The effect can be either subtle or it can totally obliterate the picture. A vast range of options is available so to describe it as just a camera shudder is limiting the filter. By changing some of the options the filter will not behave as a camera shudder, though the effect will still be in there in the maths, the result will be nothing like any camera shudder ever seen (unless your camera can do odd inverse tricks and add the pixels and do the odd sine wave on the resulting values... those cameras might be out in the shop really soon but don't hold your breath on that on).

Shuddering can be set to work in the red channel, or the green channel or the blue channel; the effect can be turned off entirely in those channels. Note, some effects might still affect the channels even if the shudder settings are zilch but the checkboxes beside the RGB will stop any processed results on that channel.

Some of the options will appear to do nothing such as modifying the direction or using the inverse when another option is set to inverse - they will just cancel themselves out and you will probably end up with the same picture. This filter is not the quickest though, and setting the >> to 30 or 40 or so and setting some of the combos to the last entry will probably slow it down to the speed of .. well, make a cup of tea and go and sit and watch an episode of Sabrina (OK, perhaps in a year the filter will be chomped speed wise but this is on the basis of a 400MHz - a probably reasonable spec for a graphics machine perhaps?)

Please note that some of the controls have multiple purposes - the prime purpose is indicated. Also note that some of the controls will have no effect such as the X and Y if the (*) has not been set to on. Some of the options in the dropdowns use the X Y, or if no inverse option is set then the () will be ignored. Also note that the preview might not match the end result - especially if the setting is at less than 25% or so - to get a 99% accurate view of the end result please set the preview to 100%.

X - x coordinate. This is generally used by the spotlight (*). The spotlight applies the (*) factor to the current effect. By setting it to 0,0 the effect will be strongest in the top left corner - as you move the settings the spotlight will change position. Once the spotlight is past the edge of the picture the spotlight will just get brighter and brighter until it either obliterates the picture or completely darkens the picture (in most cases).

Y - y coordinate

R-> - Shift or increase shudder effect for red channel

G-> - Shift or increase shudder effect for green channel

B-> - Shift or increase shudder effect for blue channel

Red checkbox - apply effect to red channel

Green checkbox - apply effect to green channel

Blue checkbox - apply effect to blue channel

Combo 1 - Coordinate mode - XY, radial etc.

Combo 2 - Placement of the effect - so if you set it upside down you will get the effect upside down.

Combo 3 - How the effect is applied - if the values are added or subtracted etc.

Combo 4 - general special effects

Combo 5 - How the result of the shudder is applied

Combo 6 - How the R> etc. is displayed

Combo 7 - Direction of the effect.

Mix - Mix image with effect

() - Inverse

Dim - dimmer switch - especially useful if using >>

| | - gap between shudder effects when using >>

# - creates a grid break between effect and image

f1 - general modifier especially used for placement

f2 - general modifier used in direction of effect and replacement effects

>> - repeat shudders - if set to greater than 1 can really slow the plugin

(*) - Spotlight - use x and y coordinates

Checkbox 1 - apply spotlight

Checkbox 2 - apply reverse effect of spotlight

R> - Red threshold - if the red channel is greater than this value apply effect if not use the replace combo.

G> - Green threshold

B> - Blue Threshold

Checkbox 3 - Replacement setting comes into effect in certain apply modes.