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Scripting Photoshop, 3.1 Photoshop scripting guidelines

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3 Scripting Photoshop 3.1 Photoshop scripting guidelines Once you are used to thinking of Photoshop as an object oriented environment, as discussed in Chapter two, you are ready to move on to writing scripts for the application. It is important to think of the objects in Photoshop as part of an "object containment hierarchy". The diagram below, read from left to right, illustrates Photoshop's containment hierarchy. The following guidelines will also help save debugging time when running Photoshop scripts. ● Before running scripts make sure Photoshop's Text Tool is not selected and no dialog boxes are displayed to avoid script run-time errors. ● Select documents by name rather than numeric index and set the current document in your script before working on it. Document numbers do not represent their stacking order. See 3.4, "Object references" on page 42 for more information. ● In AppleScript always create your document with a name and later get that document by name. -- get the front-most document set docRef to make new document with properties ¬ { height:pixels 144, width:pixels 144, resolution:50,¬ name:"My Document"} ● When working in VB or JavaScript, store the document reference to a newly-created document to reuse later. ● When running AppleScripts and two documents are open with the same name, both documents will be modified when the name is referenced. For example, the following script would modify the color profile of all open documents named "MyDocument." tell application "Adobe Photoshop 7.0" set color profile kind of document "MyDocument" to none end tell Photoshop 7.0 Scripting Guide 33

Section	Page
Photoshop 7.0 Scripting Guide	1
Table of contents	3
Introduction	5
1.1 About this manual	5
1.1.1 Conventions in this guide	5
1.2 What is scripting?	6
1.3 Why use scripting?	6
1.4 What about actions?	6
1.5 System requirements	6
1.5.1 Mac	7
1.5.2 Windows	7
1.6 JavaScript	7
1.7 Choosing a scripting language	7
1.8 Legacy COM scripting	8
Scripting basics	9
2.1 Documents as objects	9
2.2 Object model concepts	9
2.2.1 Object classes	9
2.2.2 Object inheritance	10
2.2.3 Object elements or collections	10
2.2.4 Object reference	10
2.3 Documenting scripts	11
2.4 Values	12
2.5 Variables	14
2.5.1 Assigning values to variables	14
2.5.2 Using variables to store references	15
2.5.3 Naming variables	15
2.6 Operators	16
2.7 Commands and methods	17
2.7.1 Conditional statements	17
2.7.2 Control structures	18
2.8 Handlers, subroutines and functions	20
2.9 The Scripts menu	21
2.9.1 Scripts folder	21
2.9.2 The scripts dialog box	21
2.10 Testing and troubleshooting	23
2.10.1 AppleScript debugging	23
2.10.2 Visual Basic debugging	25
2.10.3 JavaScript Debugging	26
2.10.4 Error handling	31
Scripting Photoshop	33
3.1 Photoshop scripting guidelines	33
3.2 Viewing Photoshop objects, commands and methods	34
3.2.1 Viewing Photoshop’s AppleScript dictionary	34
3.2.2 Viewing Photoshop’s type library (VB)	35
3.3 Your first Photoshop script	36
3.3.1 AppleScript	36
3.3.2 Visual Basic	37
3.3.3 VBScript	39
3.3.4 JavaScript	41
3.4 Object references	42
3.4.1 AppleScript	42
3.4.2 Visual Basic and JavaScript	43
3.5 Working with units	44
3.5.1 Unit values	44
3.5.2 Unit value useage	46
3.5.3 Changing ruler and type units	48
3.6 Executing JavaScripts from AS or VB	48
3.6.1 Passing arguments to JavaScript	49
3.6.2 Executing one-line JavaScripts	50
3.7 The Application object	50
3.8 Document object	54
3.8.1 Saving documents and save options	55
3.8.2 Document information	56
3.8.3 Document manipulation	57
3.9 Layer objects	58
3.9.1 Setting the Active layer	61
3.9.2 Layer sets	61
3.9.3 Linking layers	62
3.9.4 Applying styles to layers	63
3.9.5 Rotating layers	63
3.10 Text item object	64
3.10.1 Setting the contents of the text item	65
3.10.2 Setting text stroke colors	66
3.10.3 Setting fonts	66
3.10.4 Warping text	67
3.11 Selections	67
3.11.1 Defining selections	68
3.11.2 Stroking the selection border	69
3.11.3 Inverting selections	70
3.11.4 Expand, contract and feather selections	70
3.11.5 Filling a selection	71
3.11.6 Rotating selections	72
3.11.7 Loading and storing selections	73
3.12 Working with Filters	74
3.12.1 Selecting channel(s) to filter	74
3.12.2 Other filters	75
3.13 Channel object	75
3.13.1 Channel types	75
3.13.2 Setting the active channel	76
3.13.3 Creating new channels	76
3.14 Color objects	77
3.14.1 Setting a Color	77
3.14.2 Getting and converting colors	78
3.14.3 Comparing Colors	79
3.14.4 Getting a Web Safe Color	79
3.15 History object	80
3.15.1 Filling a selection with a history state	81
3.16 Clipboard interaction	81
3.16.1 Copy	81
3.16.2 Copy merged	82
3.16.3 Cut	82
3.16.4 Paste	83
3.16.5 Paste into command	83
3.17 Action Manager scripting	84
3.17.1 Using the Action Manager from JavaScript	84
3.17.2 Using the Action Manager from VBScript	87

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Photoshop 7.0 Scripting Guide

Scripting Photoshop

3.1 Photoshop scripting guidelines

Once you are used to thinking of Photoshop as an object oriented environment, as discussed in

Chapter two, you are ready to move on to writing scripts for the application. It is important to

think of the objects in Photoshop as part of an “object containment hierarchy”. The diagram

below, read from left to right, illustrates Photoshop’s containment hierarchy.

The following guidelines will also help save debugging time when running Photoshop scripts.

●

Before running scripts make sure Photoshop’s Text Tool is not selected and no dialog boxes

are displayed to avoid script run-time errors.

●

Select documents by name rather than numeric index and set the current document in your

script before working on it. Document numbers do not represent their stacking order. See

3.4, “Object references” on page 42

for more information.

●

In AppleScript always create your document with a name and later get that document by

name.

-- get the front-most document

set docRef to make new document with properties ¬

{ height:pixels 144, width:pixels 144, resolution:50,¬

name:"My Document"}

●

When working in VB or JavaScript, store the document reference to a newly-created

document to reuse later.

●

When running AppleScripts and two documents are open with the same name, both

documents will be modified when the name is referenced. For example, the following

script would modify the color profile of all open documents named “MyDocument.”

tell application "Adobe Photoshop 7.0"

set color profile kind of document "MyDocument" to none

end tell