Supported Image File Formats/en - Versionsgeschichte

Cg: /* Image Reading */

2023-07-18T13:27:01Z

Image Reading

← Nächstältere Version		Version vom 18. Juli 2023, 13:27 Uhr
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	If one of those messages is sent to the common superclass "ImageReader", it will try to determine the format (from the file extension and/or the first few header bytes in the data.		If one of those messages is sent to the common superclass "ImageReader", it will try to determine the format (from the file extension and/or the first few header bytes in the data.

	IF it is sent to a concrete reader class (GIFReader, JPEGReader, TIFFReader, PNReader etc..) the format should match the readers expectations. You get a list of existing readers via "ImageReader allSubclasses" or by opening a System Browser ("''Extras''" - "''Tools''" - "''Class Browser''")		IF it is sent to a concrete reader class (GIFReader, JPEGReader, TIFFReader, PNReader etc..) the format should match the readers expectations. You get a list of existing readers via "ImageReader allSubclasses" or by opening a System Browser ("''Extras''" → "''Tools''" → "''Class Browser''")

	== Image Writing ==		== Image Writing ==

Cg am 23. Juni 2022 um 12:54 Uhr

2022-06-23T12:54:39Z

← Nächstältere Version		Version vom 23. Juni 2022, 12:54 Uhr
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	The underlying runtime framework supports the most common bitmap/image formats:		The underlying runtime framework supports the most common bitmap/image formats:
	GIF, JPEG, PNG, TIFF, BMP, XPM and a few other less common formats.		GIF, JPEG, PNG, TIFF, BMP, XPM and a few other less common formats.

		⚫	=== Other Formats ===
		⚫	Support for other formats, which are more or less of historic interest, can be made available upon request and at some extra charge: XWD, Targa, Sun-Raster, PICT, PCX, PBM, OSX-Icon, IrisRGB. Also, subset of the AVI and FLI formats can be provided if there is a need.

	== Image Reading ==		== Image Reading ==
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	Although expecco supports a wide range of bitmap image formats, some rarely used formats are not supported, or only supported with limitations.		Although expecco supports a wide range of bitmap image formats, some rarely used formats are not supported, or only supported with limitations.

	== GIF ==		=== GIF ===

	Reading and writing of 8 bit/pixel palette images is supported.		Reading and writing of 8 bit/pixel palette images is supported.
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	Tiled images with multiple palettes are not supported.		Tiled images with multiple palettes are not supported.

	== JPEG ==		=== JPEG ===

	Reading and writing of 24bit/pixel is supported.		Reading and writing of 24bit/pixel is supported.
	Expecco uses the libjpeg library, so any format supported by that (standard) library will also be supported by expecco.		Expecco uses the libjpeg library, so any format supported by that (standard) library will also be supported by expecco.

	== PNG ==		=== PNG ===
	(see http://www.schaik.com/pngsuite/pngsuite.html)		(see http://www.schaik.com/pngsuite/pngsuite.html)

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	When writing, expecco will always generate either 8bpp palette, or 24bpp truecolor images.		When writing, expecco will always generate either 8bpp palette, or 24bpp truecolor images.

	== BMP ==		=== BMP ===

	1, 4, 8, 24 and 32 bpp files can be read and written.		1, 4, 8, 24 and 32 bpp files can be read and written.

	== TIFF ==		=== TIFF ===
	Most formats are supported in reading, with some limitations:		Most formats are supported in reading, with some limitations:
	* supported compressions:		* supported compressions:
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	1, 4, 8 and 24 bit files can be written. Data is always written uncompressed. No support for image masks or alpha channels.		1, 4, 8 and 24 bit files can be written. Data is always written uncompressed. No support for image masks or alpha channels.

	== XBM ==		=== XBM ===
	Both, reading and writing		Both, reading and writing

	== XPM ==		=== XPM ===
	Some restrictions apply (to be documented)		Some restrictions apply (to be documented)

⚫	== Other Formats ==
⚫	Support for other formats, which are more or less of historic interest, can be made available upon request and at some extra charge: XWD, Targa, Sun-Raster, PICT, PCX, PBM, OSX-Icon, IrisRGB. Also, subset of the AVI and FLI formats can be provided if there is a need.

Cg am 23. Juni 2022 um 12:53 Uhr

2022-06-23T12:53:26Z

← Nächstältere Version		Version vom 23. Juni 2022, 12:53 Uhr
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	The underlying runtime framework supports the most common bitmap/image formats:		The underlying runtime framework supports the most common bitmap/image formats:
			GIF, JPEG, PNG, TIFF, BMP, XPM and a few other less common formats.
	GIF
	JPEG
	PNG
	TIFF
	BMP
	XPM

	== Image Reading ==		== Image Reading ==

Cg am 23. Juni 2022 um 12:52 Uhr

2022-06-23T12:52:37Z

← Nächstältere Version		Version vom 23. Juni 2022, 12:52 Uhr
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			The underlying runtime framework supports the most common bitmap/image formats:
			GIF
			JPEG
			PNG
			TIFF
			BMP
			XPM

			== Image Reading ==
			Elementary code can access readers as subclasses of ImageReader (a slightly missleading name - most of them can write image files as well). To read an an image, use one of:
			<readerClass> fromFile: 'someFilename'
			<readerClass> fromStream: aReadStream
			<readerClass> fromBase64Stream: aReadStream
			<readerClass> fromBytes: aByteCollection
			<readerClass> fromURL: 'aURL'

			If one of those messages is sent to the common superclass "ImageReader", it will try to determine the format (from the file extension and/or the first few header bytes in the data.

			IF it is sent to a concrete reader class (GIFReader, JPEGReader, TIFFReader, PNReader etc..) the format should match the readers expectations. You get a list of existing readers via "ImageReader allSubclasses" or by opening a System Browser ("''Extras''" - "''Tools''" - "''Class Browser''")

			== Image Writing ==
			An image can be saved in a file or sent to a stream in one of the supported formats with:
			<readerClass> save: anImage onFile: 'someFilename'
			<readerClass> save: anImage onStream: aStream

			== Capturing Images ==
			Images can be captured from the screen with:
			Image fromScreen
			Image fromScreen: aRectangle

			== Manipulating Images ==
			A few often used image manipulation functions are already built in. More siphisticated functions can be called via Python or C actions, which call into an imported image maniulation library.

			Things you can do out-of-the-box are:
			anImage magnifiedBy:scaleFactor
			anImage magnifiedTo:anExtent smooth:aBoolean
			anImage magnifiedPreservingRatioTo:anExtent smooth:aBoolean
			anImage rotatedBy: angleInDegrees
			anImage subImageIn: aRetangle
			anImage flipVertical / flipHorizontal

			=== Examples ===

			==== Take a Screenshot, extracting a Rectangle, scaling it and saving on File ====

			\|img subImg magImg\|

			img := Image fromScreen.
			subImg := img subImageIn:( 0@0 extent:400@400).
			magImg := subImg magnifiedTo:200@200 smooth:true.
			PNGReader save:magImg onFile:'testFile.png'.
			"/ the following opens a viewer on the file
			OperatingSystem openApplicationForDocument:'testFile.png' operation:#open.

			== Limitations ==

	Although expecco supports a wide range of bitmap image formats, some rarely used formats are not supported, or only supported with limitations.		Although expecco supports a wide range of bitmap image formats, some rarely used formats are not supported, or only supported with limitations.

Mawalch am 5. Juni 2017 um 12:48 Uhr

2017-06-05T12:48:43Z

← Nächstältere Version		Version vom 5. Juni 2017, 12:48 Uhr
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	Although expecco supports a wide range of bitmap image formats,		Although expecco supports a wide range of bitmap image formats, some rarely used formats are not supported, or only supported with limitations.
	some seldom used formats are not supported, or only supported with limitations.

	== GIF ==		== GIF ==

	~~reading~~ and writing of 8 bit/pixel palette images is supported.		Reading and writing of 8 bit/pixel palette images is supported.
	Other images should be converted to 8bpp before writing.		Other images should be converted to 8bpp before writing.
	Tiled images with multiple palettes are not supported.		Tiled images with multiple palettes are not supported.
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	== JPEG ==		== JPEG ==

	~~reading~~ and writing of 24bit/pixel is supported.		Reading and writing of 24bit/pixel is supported.
	Expecco uses the ~~libjpg~~ library, so any format supported by that (standard) library will also be supported by expecco.		Expecco uses the libjpeg library, so any format supported by that (standard) library will also be supported by expecco.

	== PNG ==		== PNG ==
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	* Grayscale + alpha: reading unsupported (as of 2.11)		* Grayscale + alpha: reading unsupported (as of 2.11)
	* 16bit RGB + alpha: incorrect display		* 16bit RGB + alpha: incorrect display
	* ~~TRNS~~ chunk with alpha values (only on-off masks)		* tRNS chunk with alpha values (only on-off masks)

	When writing, expecco will always generate either 8bpp palette, or 24bpp truecolor images.		When writing, expecco will always generate either 8bpp palette, or 24bpp truecolor images.
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	== BMP ==		== BMP ==

	1,4,8,24 and 32 bpp files can be read and written.		1, 4, 8, 24 and 32 bpp files can be read and written.

	== TIFF ==		== TIFF ==
	~~most~~ formats are supported in reading, with some limitations:		Most formats are supported in reading, with some limitations:
	* supported compressions:		* supported compressions:
	** CCITT group3 FAX compression		** CCITT group3 FAX compression
	** LZW		** LZW
	** packbits		** packbits


	1, 4, 8 and 24 bit files can be written. Data is always written uncompressed. No support for image masks or alpha channels.		1, 4, 8 and 24 bit files can be written. Data is always written uncompressed. No support for image masks or alpha channels.

	== XBM ==		== XBM ==
	~~both~~ reading and writing		Both, reading and writing

	== XPM ==		== XPM ==
	~~some~~ restrictions apply (to be documented)		Some restrictions apply (to be documented)

	== Other Formats ==		== Other Formats ==
	Support for other formats, which are more or less of historic interest,		Support for other formats, which are more or less of historic interest, can be made available upon request and at some extra charge: XWD, Targa, Sun-Raster, PICT, PCX, PBM, OSX-Icon, IrisRGB. Also, subset of the AVI and FLI formats can be provided if there is a need.
	can be made available upon request and at some extra charge: XWD, Targa, Sun-Raster, PICT, PCX, PBM, OSX-Icon, IrisRGB. Also, subset of the AVI and FLI formats can be provided if there is a need.

Cg: /* TIFF */

2017-02-17T12:30:49Z

TIFF

← Nächstältere Version		Version vom 17. Februar 2017, 12:30 Uhr
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	** packbits		** packbits

	1, 4, 8 and 24 bit files can be written. No support for image masks or alpha channels.		1, 4, 8 and 24 bit files can be written. Data is always written uncompressed. No support for image masks or alpha channels.

	== XBM ==		== XBM ==

Cg: /* TIFF */

2017-02-17T12:29:32Z

TIFF

← Nächstältere Version		Version vom 17. Februar 2017, 12:29 Uhr
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	** packbits		** packbits

	1, 4, 8 and 24 bit files can be written		1, 4, 8 and 24 bit files can be written. No support for image masks or alpha channels.

	== XBM ==		== XBM ==

Cg: /* Other Formats */

2017-02-17T12:28:31Z

Other Formats

← Nächstältere Version		Version vom 17. Februar 2017, 12:28 Uhr
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	== Other Formats ==		== Other Formats ==
	Support for other formats, which are more or less of historic interest,		Support for other formats, which are more or less of historic interest,
	can be made available upon request and at some extra charge: ~~XWN~~, Targa, Sun-Raster, PICT, PCX, PBM, OSX-Icon, IrisRGB. Also, subset of the AVI and FLI formats can be provided if there is a need.		can be made available upon request and at some extra charge: XWD, Targa, Sun-Raster, PICT, PCX, PBM, OSX-Icon, IrisRGB. Also, subset of the AVI and FLI formats can be provided if there is a need.

Cg: /* TIFF */

2017-02-17T12:27:37Z

TIFF

← Nächstältere Version		Version vom 17. Februar 2017, 12:27 Uhr
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	== TIFF ==		== TIFF ==
	most formats are supported in reading.		most formats are supported in reading, with some limitations:
			* supported compressions:
			** CCITT group3 FAX compression
			** LZW
			** packbits

	1, 4, 8 and 24 bit files can be written		1, 4, 8 and 24 bit files can be written

Cg: /* BMP */

2017-02-17T12:24:00Z

BMP

← Nächstältere Version		Version vom 17. Februar 2017, 12:24 Uhr
Zeile 23:		Zeile 23:

	== BMP ==		== BMP ==

	most formats are supported in reading;
	1,4,8 and 24 ~~bit~~ files can be written.		1,4,8,24 and 32 bpp files can be read and written.

	== TIFF ==		== TIFF ==