Scale Path With Blur Effect

Hello
This should be simple, I must be missing something obvious.
For simplicity let's say I have a circle with a 20px Gaussian Blur effect. If I scale it to be 10% of its original size, with 'Scale Stroke and Effects' ticked, it still has a 20px blur. How do I scale the circle without expanding its appearance please. I would like to retain the effect but it end up a 2px blur.
Thank you.
Chris

Hello Kurt
I had never noticed that the Transform effect scales the effects correctly as well.
Thanks.

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I'm having this odd problem with keyframe effects.
Setup:
I have a gif image that I have on video 1 for say 2 minutes.
I have my real video on video 2. It is a person talking.
First I start with my video full size on top of video 1.
Though the motion and cropping keyframe management I slowly reduce the scale and crop my video image so that it is reduced to the lower left bottom of the screen, on top of the gif, which is now revealed.
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Bill,
Here is more detail and screen captures.
Concept:
I have 3 minutes of video. It contains a person making a speech. During parts of the speech I want to reveal a graphic image that will be discussed. The speech will begin with the speaker full screen. Half way in, the speaker will shrink down to 45% in the lower left corner of the screen. While the animation occurs (the shrink, move and cropping) it will reveal the graphic below. The graphic will take up the full screen with the speaker at 45%.
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I am manually adding keyframes at the start and end of the animation. I set the ending state of the video image in the end keyframes. The interpolation between these start and end keyframes should be managing the animation.
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At the beginning and end of the animation – usually 1-3 frames from the start and 1-3 frames from the end, where the change has barely begun or almost ended, I get these problems. On some frames, the video (in Video 2) completely disappears only showing the Video 1 GIF image below. On other frames, the video image turns black with horizontal red bands half way across.
Troublshooting:
I’ve tried deleting all start and end keyframes and moving the start and end earlier or later to see if I can fix this, but the problem continues to show up in these new locations.
I have added a few screen shots.
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I've only been using Premiere for a single project as my university specified we should use it, I'm not used to such a complex programme, or even video editing to be honest, so bear with me. (I'm following that guide on what information to add to questions on this forum)
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Problem Event Name:
APPCRASH
Application Name:
Adobe Premiere Pro.exe
Application Version:
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Application Timestamp:
52aed7f3
Fault Module Name:
OpenCL.dll
Fault Module Version:
1.2.11.0
Fault Module Timestamp:
52a242a8
Exception Code:
c0000005
Exception Offset:
0000000000002b89
OS Version:
6.1.7601.2.1.0.768.3
Locale ID:
2057
Additional Information 1:
5273
Additional Information 2:
52739eafd9c00fbd41b66266050284b2
Additional Information 3:
750c
Additional Information 4:
750c2263c4fb3446348e7454d5714618
Computer:
Processor
Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz, 3501 Mhz, 4 Core(s), 8 Logical Processor(s)
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I am refering to any of the blur category filters in the effects browser. I think there are like 6 of them sharpen, gaussian, prism, radial, and zoom. What happens is if I select a clip then go to the effects browser and scroll over the filters I will initially see a preview as you are supposed to. But very quickly that stops and if I go back to the timeline the viewer is frozen showing the previously selected clip. All the rest of FCP works normally ie you can scroll the timeline, select clips, use the tools etc. Only the viewer is frozen. You have to force quit FCP and restart to get back to normal. None of the other effects in effects browser cause any problems.
I said in my first message all the things I have tried unsuccessfully. This one is a real puzzler for me.

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Thank you

Hi !
Thank you ! it's perfect !
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Use lens blur effect with ae cc

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Script to Edit Gaussian Blur Effect

Hello
I have a complex piece of artwork which has to be scaled up by a factor of 10. No problem except the Gaussian Blur Effect will not scale.
Rather than go through each path and edit the blur amount (by a factor of 10) I had hoped I could write a script which would iterate through every path and if it had a Gaussian Blur Effect edit the value.
Looking in the AppleScript dictionary and online I can't see any way of accessing a path's Appearance or Effects.
I would be very grateful for some advice on this before I start the tedious process of manually changing the values.
Regards
Chris

Hello Mark
Thanks for your prompt reply. I thought as much. It's disappointing really.
The select filters will not unfortunately be helpful because the blurs are different so I can't select all blurred items because I don't want to set them all the same and equally I can't pick one and select all with the same blur amount because I don't know if I have changed all of the items.
I've just got my head down and am selecting them all individually and editing them!
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Scale path without affecting stroke width

Hi all,
This seems like it should be simple to do but I'm not having any luck here. Basically I have a path parented to a null that controls several things, scaling them down, rotating and moving across the composition. One of those items is a path with a stroke of 32 px. I want to be able to scale the path itself down, but leave the stroke the same.
I thought I could key the stroke width manually but that has no effect- scaling it up as the path scales down doesn't seem to change the stroke width at all at the end keyframe, only at the beginning keyframe. I see the px count start at 32 and increase up to as it moves along the timeline, even though the stroke width on screen is still getting smaller as if there were no change at all to the width.
Thanks!

You generally don't want to scale the layer that contains the stroke, you want add keyframes to the mask path and animate the size of the path. This is easy. You just start by double-clicking one of the vertices and using the transform box.
If this technique does not work for you then you have two other options, both involving expressions. Both of these options use exactly the same expression to look at the scale of your null layer and both assume that the null is at 100% scale at the start of the animation. The option that I would choose would be to replace the mask path on a layer with stroke applied with shape layer path with stroke applied. You have so many more options and you're dealing with vector information. With either solution this is the expression.
sf = thisComp.layer("Control Null 1").transform.scale[0]/100;
ov = value;
nv = ov / sf
sf (scale factor) is the x scale value of the controlling null that is the parent of the stroke layer or the layer with the stroke effect applied to a mask divided by 100. If you intend to scale X and Y of the parent you'll have to modify the expression and then combine the scale factors and this solution will not work as well. The original scale value is divided by 100 to turn it into a decimal value
ov (original value) is the original set value of the stroke.
nv (new value) is calculated by dividing the original value by the scale factor.
This is just basic algebra from the 7th grade. If your controlling parent is scaled below 0 then the stroke will go away because the value will change to a negative number. If this is necessary in your composition you can write an if statement that will change the nv back to a positive number if the scale factor becomes less than or equal to zero and solves the divide by zero error you would get with a scale factor of zero.
One last point, and this is important. This expression will produce accurate results if applied to the brush size of a mask path when using the Effects>Generate>Stroke effect to create your line but when scaled over 100% the line will begin to fall apart and anti aliasing will not be able to keep up with pixilation caused by the scale. Over about 120% the line will start to look thinner and over 140% it will look bad even though the stroke width is numerically accurate.
I'll let you take it from here.

How to create path with arrowhead?

Hello. I have a document with a single path in it. How can I apply arrowhead efect to this path? I tried using Beautiful strokes suite, but was only able to get arrowhead from existing path. How can I get one if there is no path with arrowheads in the document?

Yeah, it's really not obvious at all how to do this.
The key is to use the AIBeautifulStrokesSuite. The steps are as follows:
Get the art style of the path (AIArtStyleSuite::GetArtStyle()).
Parse the style (AIArtStyleParserSuite::NewParser(), ParseStyle()).
Get the focus stroke (AIArtStyleParserSuite::GetFocusStroke), which gets you an AIParserPaintField.
Populate the AIParserPaintField into a CPaintField (see below for code)
Use AIBeautifulStrokesSuite::SetArrowheadOptions, and pass CPaintField::GetEffectsDictionary() to the first parameter.
Call CPaintField::Save().
Create a new art style (AIArtStyleParserSuite::CreateNewStyle()).
Apply the style to the path (AIArtStyleSuite::SetArtStyle()).
Dispose of the parser (AIArtStyleParserSuite::DisposeParser()).
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The arrow head itself is set by passing in an AIPatternHandle, which is the handle to a symbol. You can set the start or end, and the other parameters are just the scale to use for the symbols and the alignment of the arrowheads (ArrowTipAlignment, found in AIBeautifulStrokes.h). The standard arrowheads are stored in an AI file in found in Support Files\Required\Resources\en_US (or whatever your language is). You get the path to this folder at runtime using AIFolders::FindFolder() and passing it kAIRequiredLocalizedResourcesFolderType. The filename is Arrowheads.ai.
If you want to read the AI file as a library, you need to use AIPathStyleSuite::ImportStyles(). You pass it the path to the AI file and it will give you an AIDocumentHandle in return. You can use this handle with methods like AISymbolSuite::GetNthSymbolPatternFromDocument(). Just be sure to retarget anything you load for your current document; to do that, you use AISymbolSuite::RetargetForCurrentDocument(). If you don't retarget the style, you'll add a reference to art that doesn't exist in your document and when you close Illustrator, it will crash (because it will try to free up the symbol twice, once for your document & once for the library you loaded, but it only existed once!).
CPaintField is a little utility class I created that basically wraps some code I was given by Adobe, so I'm happy to share it. Its useful whenever you're dealing with AIBeautifulStrokesSuite type stuff. THROW_EXCEP_IF() is a macro we use that checks error to see if its kNoErr, and if its not, we throw an exception. You can replace that with your own error checking, or just remove them, as you wish
class CPaintField {
public:
CPaintField(AIParserPaintField& paintField);
virtual ~CPaintField();
AIDictionaryRef GetEffectsDictionary() const;
void Save();
private:
ai::Ref<AIDictionaryRef> m_effectsDictionary;
ai::Ref<AILiveEffectParameters> m_newEffectParams;
AIParserPaintField& m_paintField;
AILiveEffectHandle m_paintFieldEffect;
CPaintField::CPaintField(AIParserPaintField& paintField) : m_paintField(paintField), m_paintFieldEffect(0)
ai::Ref<AIDictionaryRef> oldBSDict;
AILiveEffectParameters oldEffectParams = 0;
AIErr error = sArtStyleParser->GetPaintLiveEffectInfo(paintField, &m_paintFieldEffect, &oldEffectParams);
THROW_EXCEP_IF(error);
bool acceptsBSOptions = true;
if (oldEffectParams) {
    // If an old effect parameters dictionary already exists then we need to clone it,
    // so that the modifications will be done to a new art style, not to the old one.
    // We don’t do this until we discover whether or not the object will accept
    // Beautiful Strokes, though, because it may be that we are not modifying anything.
    acceptsBSOptions = true;
    AIErr error = sBeautifulStrokes->GetParamsDict(oldEffectParams, *(oldBSDict << ai::Replace));
    THROW_EXCEP_IF(error);
    if (acceptsBSOptions) {
      // Create an empty effect params dict
      AIErr error = sLiveEffect->CreateLiveEffectParameters( m_newEffectParams << ai::Replace );
      THROW_EXCEP_IF(error);
      // Clone all the contents of the oldEffectParams into the newEffectParams
      AIErr error = sDictionary->Copy(m_newEffectParams, oldEffectParams);
      THROW_EXCEP_IF(error);
} else {
    // If there are no oldEffectParams, then the stroke can accept Beautiful Stroke options,
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    AIErr error = sLiveEffect->CreateLiveEffectParameters(m_newEffectParams << ai::Replace);
    THROW_EXCEP_IF(error);
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    AIArtStylePaintData paintData;
    AIErr error = sArtStyleParser->GetStroke(paintField, &strokeStyle, &paintData);
    THROW_EXCEP_IF(error);
    // It is also necessary to transfer the StrokeStyle into the effect params dictionary
    // ourselves, because AIArtStyleParser doesn’t do so for us.
    AIErr error = sDictionary->Set(m_newEffectParams, sDictionary->Key(kStrokeStyleKey), sEntry->FromStrokeStyle(&strokeStyle));
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if (m_newEffectParams && acceptsBSOptions) {
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      // So pull the new Beautiful Strokes parameter dictionary out of there.
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      THROW_EXCEP_IF(error);
    } else {
      // Insert a blank Beautiful Strokes dictionary into the new effects dictionary.
      AIErr error = sBeautifulStrokes->CreateParamsDict(m_newEffectParams, *(m_effectsDictionary << ai::Replace));
      THROW_EXCEP_IF(error);
CPaintField::~CPaintField()
void CPaintField::Save()
AIErr error = sArtStyleParser->SetPaintLiveEffectInfo(m_paintField, m_paintFieldEffect, m_newEffectParams);
THROW_EXCEP_IF(error);
AIDictionaryRef CPaintField::GetEffectsDictionary() const
return m_effectsDictionary;

Scale Path With Blur Effect

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