Monkeybread Software - MBS FileMaker Plugin: CGImageSource.ThumbnailAtIndex

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CGImageSource.ThumbnailAtIndex

Creates a thumbnail image of the image located at a specified location in an image source.

Component	Version	macOS	Windows	Linux	Server	FileMaker iOS SDK
CGImageSource	3.4	Yes	No	No	Yes, macOS only	Yes

MBS( "CGImageSource.ThumbnailAtIndex"; Ref; Index { ; ImageType; FileName } ) More

Parameters

Parameter Description Example Flags

Ref The image source reference number returned by CGImageSource.CreateWithData, CGImageSource.CreateWithPath or CGImageSource.CreateWithURL $ref

Index The index of the image to query. -1 for global properties. Else a number from 0 to CGImageSource.Count-1. 0

ImageType The type of image to return.
Either JPEG, PNG, GIF or BMP. Default is JPEG. "JPEG" Optional

FileName The filename to use for the picture.
Default is "image" with the extension matching the image type. "test.jpg" Optional

Parameter	Description	Example	Flags
Ref	The image source reference number returned by CGImageSource.CreateWithData, CGImageSource.CreateWithPath or CGImageSource.CreateWithURL	$ref
Index	The index of the image to query. -1 for global properties. Else a number from 0 to CGImageSource.Count-1.	0
ImageType	The type of image to return. Either JPEG, PNG, GIF or BMP. Default is JPEG.	"JPEG"	Optional
FileName	The filename to use for the picture. Default is "image" with the extension matching the image type.	"test.jpg"	Optional

Result

Returns image or error message.

Description

Creates a thumbnail image of the image located at a specified location in an image source.
If the image source is a PDF, this function creates a 72 dpi image of the PDF page specified by the index that you pass.
Maximum thumbnail size is 512 pixel.
This function can be used to query previews of various image formats including RAW images. (everything Preview app can also open)

Examples

Create a thumbnail:

Set Variable [$ref; Value:MBS("CGImageSource.CreateWithData"; MyTable::ImageFile)]
Set Variable [$image; Value:MBS("CGImageSource.ThumbnailAtIndex"; $ref; 0; "JPEG"; "thumbnail.jpg")]
Set Variable [$r; Value:MBS("CGImageSource.Release"; $ref)]

Create thumbnail from a file on disk:

Set Variable [ $path ; Value: "/Users/cs/Pictures/IMG_3625.jpg" ]
Set Variable [ $img ; Value: MBS( "CGImageSource.CreateWithPath"; $path ) ]
Set Field [ test::output ; MBS( "CGImageSource.ThumbnailAtIndex"; $img; 0; "JPEG"; "thumbnail.jpg")]
Set Variable [ $r ; Value: MBS( "CGImageSource.Release"; $img ) ]

Blog Entries

MBS Filemaker Plugin, version 4.3pr2

Created 18th August 2014, last changed 29th September 2020

CGImageSource.SupportedTypes - CGImageSource.Type