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------------------------------
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XJT Fileformat specification:
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------------------------------
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(XJT 1.1.16b, 2000.02.05) unit
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(XJT 1.1.15b, 2000.01.30) paths
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(XJT 1.1.15a, 2000.01.23)
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(XJT 1.1, 1998.10.31 - 1999.03.16)
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XJT Fileformat was designed to save compressed GIMP Images with
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all the properties that are available in GIMP.
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XJT uses JPEG compression foreach layer or channel and TAR to
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collect all layers in one file. (Layers with alphachannels
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are splitted into 2 jpeg files)
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Additional property informations about offsets, opacity, layernames etc..
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are stored in the readable textfile called "PRP" (Properties)
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The resulting tar-file is optionaly compressed a 2.nd time
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(depends on the filename ending "gz" or "bz2")
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Filename Extensions are:
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image.xjt # plain tar file
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image.xjtgz # gzip compressed tar file
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image.xjbz2 # bzip2 compressed tar file
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** XJT does not support INDEXED Images. **
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Why should anyone use the new XJT Fileformat ?
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---------------------------------------------
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- The high JPEG compression rates (1:10 and more) helps
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to save a lot of Diskspace.
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(especially if you are using GIMP and GAP to
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store many images as AnimFrames )
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- Saved image keeps all layers channels and properties
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- single Layers can be extracted using tar
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and then be accessed by many other
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jpeg-compatible programs.
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- JPEG is a lossy compression.
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After save and load the bitmapdata
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differs a little from the original,
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depending on the used quality setting.
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==> use GIMP's native xcf format
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where you need exactly the original.
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GIMP_XJ_IMAGE ver:"1.0" w/h:256,256
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L0 acl fsl pt o:35,116 n:"Pasted Layer"
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L1 ln pt aml eml o:0,7 n:"Pasted Layer"
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m1 smc o:0,7 n:"Pasted Layer mask"
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c0 op:33.725 iv smc c:255,0,0 n:"saved selection mask"
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TAR Contents of the example file
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--------------------------------
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-rw-r--r-- hof/users 228 Nov 1 11:19 1998 PRP
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-rw-r--r-- hof/users 2352 Nov 1 11:19 1998 c0.jpg
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-rw-r--r-- hof/users 3789 Nov 1 11:19 1998 l0.jpg
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-rw-r--r-- hof/users 8569 Nov 1 11:19 1998 l1.jpg
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-rw-r--r-- hof/users 9098 Nov 1 11:19 1998 l2.jpg
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-rw-r--r-- hof/users 3926 Nov 1 11:19 1998 la0.jpg
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-rw-r--r-- hof/users 6095 Nov 1 11:19 1998 la1.jpg
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-rw-r--r-- hof/users 1623 Nov 1 11:19 1998 lm1.jpg
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The example image has dimensions of 256x256 pixels.
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The Image Type is RGB (default Property typ:0)
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L0 The Image has a floating selection (stored as l0.jpg) at offset 35/116.
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The floating selection has an alpha channel (stored in la0.jpg)
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The floating selection is the active Layer.
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There are 2 further Layers.
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L1 at offset 077 is named "Pasted Layer" and is stored in l1.jpg.
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This Layer has both an alpha channel (stored in la1.jpg)
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and a LayerMask (stored in lm1.jpg)
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(the Properties of the LayerMask are stored in an extra Line
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of the PRP file beginning with m1)
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l2 is the Background Layer without alpha channel. (stored in l2.jpg)
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The Floating selection is attached to this layer ("fa" Property)
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c0 The image has one extra channel named "saved selection mask"
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This channel has full red color (c:255,0,0 property) and an opacity
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value of 33.725 % but is invisible ("iv" property)
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Syntax of the PRP -file
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-----------------------
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Image Properties (must be the 1. line in the PRP file)
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GIMP_XJ_IMAGE Image-fileformat-Identifier
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followed by a List of Image properties seperated by Blank:
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PROP_GUIDES (can occure more than 1 time)
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PROP_PARASITES (can occure more than 1 time)
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l<nr> Layer description of layer <nr> without alpha channel.
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the layers bitmapdata is stored in a jpeg encoded
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L<nr> Layer description of layer <nr> with alpha channel.
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the layers bitmapdata is stored in a jpeg encoded
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file named l<nr>.jpg,
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the alpha channel is stored in an additional jpeg encoded
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file named la<nr>.jpg,
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followed by a List of Layer properties seperated by Blank:
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(properties for the default values are not written)
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PROP_FLOATING_SELECTION
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PROP_FLOATING_ATTACHED
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PROP_PRESERVE_TRANSPARENCY
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PROP_PARASITES (can occure more than 1 time)
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c<nr> Channel description of channel <nr>.
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the channels bitmapdata is stored in a jpeg encoded
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m<nr> Layermask-channel of layer <nr>
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the layermask-channels bitmapdata is tored in a jpeg encoded
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followed by a List of Channel properties seperated by Blank:
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(properties for the default values are not written)
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PROP_FLOATING_ATTACHED
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PROP_PARASITES (can occure more than 1 time)
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p<nr> Parasite description of parasite <nr>.
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the parasite data is stored 1:1 in a
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followed by a List of Parasite properties seperated by Blank:
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(properties for the default values are not written)
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PATH Path identstring.
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the parasite data is stored 1:1 in a
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followed by a List of Path properties seperated by Blank:
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(properties for the default values are not written)
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--------------------------
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--------------------------
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--------------------------
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mnemonic:int_value,int_value
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mnemonic:int_value,int_value,int_value
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mnemonic:float_value,float_value
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mnemonic:float_value[,float_value ...]
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xjt uses max 5 digits behind the comma.
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precision of max 5 digits
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17.00000999 is truncated to 17
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2.00001999 is truncated to 2.00001
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mnemonic:"string_value"
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If a String contains DoublleQuote Backslash
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or newline Characters, they are escaped by
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a preceeding Backslash character.
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hello "quotes" and \backslash
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n:"hello \"quotes\" and \\backslash"
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Properties are written as short mnemonics (1 upto 3 characters) to identify the Property.
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Non-boolean Property-mnemonics require a Value seperated by ':'.
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For each property there is a defined Defaultvalue. (usually 0, or "" for strings)
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The Defaultvalue is assumed when the Token is not specified,
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Boolean tokens default always to FALSE and become TRUE when specified.
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/* property mnemonic type default values */
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PROP_END, "*", PTYP_NOT_SUPPORTED, 0,
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PROP_COLORMAP, "*", PTYP_NOT_SUPPORTED, 0,
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PROP_ACTIVE_LAYER, "acl", PTYP_BOOLEAN, FALSE,
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PROP_ACTIVE_CHANNEL, "acc", PTYP_BOOLEAN, FALSE,
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PROP_SELECTION, "sel", PTYP_BOOLEAN, FALSE,
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PROP_FLOATING_SELECTION, "fsl", PTYP_BOOLEAN, FALSE,
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PROP_OPACITY, "op", PTYP_FLT, 100.0,
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PROP_MODE, "md", PTYP_INT, 0,
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PROP_VISIBLE, "iv", PTYP_BOOLEAN, FALSE,
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PROP_LINKED, "ln", PTYP_BOOLEAN, FALSE,
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PROP_PRESERVE_TRANSPARENCY, "pt", PTYP_BOOLEAN, FALSE,
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PROP_APPLY_MASK, "aml", PTYP_BOOLEAN, FALSE,
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PROP_EDIT_MASK, "eml", PTYP_BOOLEAN, FALSE,
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PROP_SHOW_MASK, "sml", PTYP_BOOLEAN, FALSE,
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PROP_SHOW_MASKED, "smc", PTYP_BOOLEAN, FALSE,
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PROP_OFFSETS, "o", PTYP_2xINT, 0, 0,
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PROP_COLOR, "c", PTYP_3xINT, 0, 0, 0,
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PROP_COMPRESSION, "*", PTYP_NOT_SUPPORTED, 0,
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PROP_GUIDES, "g", PTYP_2xINT, 0, 0,
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PROP_RESOLUTION, "res", PTYP_2xFLT, 72.0, 72.0,
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PROP_UNIT, "unt", PTYP_INT, 0, /* XJT_UNIT_PIXEL */
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PROP_TATTOO, "tto", PTYP_INT, 0,
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PROP_PARASITES, "pte", PTYP_INT, 0,
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PROP_PARASITE_FLAGS, "ptf", PTYP_INT, 1, /* PARASITE_PERSISTENT */
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PROP_FLOATING_ATTACHED, "fa", PTYP_BOOLEAN, FALSE,
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PROP_NAME, "n", PTYP_STRING, "",
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PROP_DIMENSION, "w/h", PTYP_2xINT, 0, 0,
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PROP_TYPE, "typ", PTYP_INT, 0,
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PROP_VERSION, "ver", PTYP_STRING, 0,
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PROP_GIMP_VERSION, "gimp", PTYP_3xINT, 0,
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PROP_PATH_POINT, "php", PTYP_FLIST, 0.0, 0.0, 0.0
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PROP_PATH_TYPE, "pht", PTYP_INT, 1, /* XJT_BEZIER_PATH */
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PROP_PATH_CURRENT, "pha", PTYP_BOOLEAN, FALSE,
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PROP_PATH_LOCKED, "phl", PTYP_BOOLEAN, FALSE,
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Property Values (Valid Ranges)
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------------------------------
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PROP_OPACITY valid values are
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0.0 (full transparent)
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PROP_TYPE valid values are:
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PROP_MODE valid values are:
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0 ... XJT_NORMAL_MODE
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1 ... XJT_DISSOLVE_MODE
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2 ... XJT_BEHIND_MODE
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3 ... XJT_MULTIPLY_MODE
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4 ... XJT_SCREEN_MODE
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5 ... XJT_OVERLAY_MODE
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6 ... XJT_DIFFERENCE_MODE
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7 ... XJT_ADDITION_MODE
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8 ... XJT_SUBTRACT_MODE
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9 ... XJT_DARKEN_ONLY_MODE
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10 ... XJT_LIGHTEN_ONLY_MODE
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12 ... XJT_SATURATION_MODE
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13 ... XJT_COLOR_MODE
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14 ... XJT_VALUE_MODE
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15 ... XJT_DIVIDE_MODE
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valid values for the 1.st integer are
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positve integers, representing x or y
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position (depends on the 2.nd value)
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valid values for the 2.nd integer are:
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0 ... XJT_ORIENTATION_HORIZONTAL
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1 ... XJT_ORIENTATION_VERTICAL
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in older xjt files (older than xjt version 1.1.15)
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there was no exact specification and the gimp internal
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representation of the guide orientation was written
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to the xjt guide orientation property.
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Unforunately this gimp internal representation has changed
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PROP_PATH_TYPE valid values are:
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1 ... XJT_BEZIER_PATH
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This property is a list of float values.
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For Paths of the type XJT_BEZIER_PATH
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each point is represented by a float value triplet
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where type can be 1 (BEZIER_ANCHOR point)
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or 2 (BEZIER_CONTROL point)
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PROP_UNIT valid values are:
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-------------------------------
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Extended Example of PRP file:
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-------------------------------
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PARASITES: The parasite data is stored in a seperate file for each
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parasite. The file is named p<id>.pte, where
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<id> is a unique integer parasite Id.
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A Layer, Channel or Image can have 0 or more PROP_PARASITE
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Properties (pte:1 pte:2 ...), where the integer parameter
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refers to the unique parasite id.
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Example of PRP file with resolution, parasites and paths:
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-------------------------------------------------------------
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GIMP_XJ_IMAGE ver:"1.1" w/h:256,256 res:72.0,100.5 pte:1
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PATH n:"Path 1" php:103,65,1,103,65,2,176,15,2,177,15,1,178,15,2,198,229,2,198,229,1,198,229,2
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L0 acl fsl pt o:35,116 n:"Pasted Layer"
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L1 ln pt aml eml o:0,7 n:"Pasted Layer" pte:2 pte:3
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m1 smc o:0,7 n:"Pasted Layer mask"
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c0 op:33.725 iv smc c:255,0,0 n:"saved selection mask" pte:4
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p1 n:"image parasite"
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p2 n:"layer parasite A"
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p3 n:"layer parasite B"
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p4 n:"channel parasite"
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TAR Contents of the example file
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--------------------------------
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>tar -tvf example.xjt
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-rw-r--r-- hof/users 228 Nov 1 11:19 1998 PRP
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-rw-r--r-- hof/users 2352 Nov 1 11:19 1998 c0.jpg
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-rw-r--r-- hof/users 3789 Nov 1 11:19 1998 l0.jpg
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-rw-r--r-- hof/users 8569 Nov 1 11:19 1998 l1.jpg
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-rw-r--r-- hof/users 9098 Nov 1 11:19 1998 l2.jpg
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-rw-r--r-- hof/users 3926 Nov 1 11:19 1998 la0.jpg
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-rw-r--r-- hof/users 6095 Nov 1 11:19 1998 la1.jpg
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-rw-r--r-- hof/users 1623 Nov 1 11:19 1998 lm1.jpg
added
removed
plug-ins/xjt/README_xjt_fileformat.txt
