Lists all PNG tag identifiers.
            
            Syntax
            Members
| Member | Description | 
| BACKGROUND | Background information. | 
| CALIBRATION | Calibration information. | 
| CHRM_BLUE | Chromaticities blue. | 
| CHRM_GREEN | Chromaticities green. | 
| CHRM_RED | Chromaticities red. | 
| CHRM_WHITE | White point. | 
| CHRM_X | Chromaticities X. | 
| CHRM_Y | Chromaticities Y. | 
| CHROMATICITIES | Chromaticities information. | 
| COMPRESSED_TEXT | Compressed textual data information. | 
| CTXT_COMPR_METHOD | Compression method. | 
| CTXT_KEYWORD | Compressed textual data chunk keyword that indicates the type of information represented by the text string. | 
| CTXT_TEXT | Compressed textual data chunk text. | 
| FORMAT | PNG metadata format identifier. | 
| FRACTAL_PARAMETERS | Fractal parameters information. | 
| GAMMA | Gamma information. | 
| GIF_APP_EXT | GIF application extension information. | 
| GIF_CONTROL | GIF contro information. | 
| GIF_TEXT_EXT | Gif text extension information. | 
| GIFG_DELAY_TIME | Delay time. | 
| GIFG_DISPOSAL_METHOD | Disposal method. | 
| GIFG_USER_INPUT_FLAG | User Input flag. | 
| GIFT_BACK_COLOR | Text background color. | 
| GIFT_CELL_HEIGHT | Character cell height. | 
| GIFT_CELL_WIDTH | Character cell width. | 
| GIFT_FORE_COLOR | Text foreground color. | 
| GIFT_GRID_HEIGHT | Text grid height. | 
| GIFT_GRID_WIDTH | Text grid width. | 
| GIFT_LEFT_POSITION | Text grid left position. | 
| GIFT_PLAIN_TEXT | Plain text data. | 
| GIFT_TOP_POSITION | Text grid top position. | 
| GIFX_APP_DATA | Application data. | 
| GIFX_APP_ID | Application identifier. | 
| GIFX_AUTHENTICATION | Authentication code. | 
| HEADER | Header information. | 
| HISTOGRAM | Histogram information. | 
| ICC_PROFILE | ICC profile information. | 
| ICCP_DATA | Profile data. | 
| ICCP_NAME | Profile name. | 
| IHDR_BIT_DEPTH | Image bit depth. | 
| IHDR_COLOR_TYPE | Color type. | 
| IHDR_COMPRESSION | Compression type. | 
| IHDR_FILTER_TYPE | Filter type. | 
| IHDR_HEIGHT | Image height. | 
| IHDR_INTERLACE_TYPE | Interlace type. | 
| IHDR_WIDTH | Image width. | 
| IMAGE_OFFSET | Image offset. | 
| INTERNATIONAL_TEXT | International textual data information. | 
| ITXT_COMPR_FLAG | Compression flag. | 
| ITXT_COMPR_METHOD | Compression method. | 
| ITXT_KEYWORD | International textual data chunk keyword that indicates the type of information represented by the text string. | 
| ITXT_LANGUAGE | Language tag. | 
| ITXT_TEXT | International textual data chunk text. | 
| ITXT_TRANSL_KEYWORD | Translated keyword. | 
| OFFS_UNIT | Unit specifier. | 
| OFFS_X_POSITION | X position. | 
| OFFS_Y_POSITION | Y position. | 
| PCAL_EQUATION | Equation type. | 
| PCAL_NAME | Calibration name. | 
| PCAL_PAR_COUNT | Number of parameters. | 
| PCAL_PARAMETER | Calibration parameter. | 
| PCAL_UNIT | Unit root. | 
| PCAL_UNIT_NAME | Unit name. | 
| PCAL_X0 | Original zero(x0). | 
| PCAL_X1 | Original Max(x1). | 
| PHYS_UNIT | Unit specifier. | 
| PHYS_X_AXIS | Intended pixel size or aspect ratio by X axis for display . | 
| PHYS_Y_AXIS | Intended pixel size or aspect ratio by Y axis for display. | 
| PHYSICAL_SCALE | Physical scale information. | 
| RESOLUTION | Resolution information. | 
| SCAL_HEIGHT | Pixel height. | 
| SCAL_UNIT | Unit specifier. | 
| SCAL_WIDTH | Pixel width. | 
| SIGNIFICANT_BITS | Significant bits information. | 
| SPLT_ALPHA | Suggested palette alpha entry value. | 
| SPLT_BLUE | Suggested palette blue entry value. | 
| SPLT_DEPTH | Sample depth. | 
| SPLT_ENTRY | Suggested palette entry. | 
| SPLT_ENTRY_COUNT | Suggested palette entry count. | 
| SPLT_FREQUENCY | Suggested palette frequency entry value. | 
| SPLT_GREEN | Suggested palette green entry value. | 
| SPLT_NAME | Palette name. | 
| SPLT_RED | Suggested palette red entry value. | 
| SRGB | Standard RGB information. | 
| SUGGESTED_PALETTE | Suggested palette information. | 
| TEXT | Text data information. | 
| TEXT_KEYWORD | Textual data chunk keyword that indicates the type of information represented by the text string. | 
| TEXT_TEXT | Textual data chunk text. | 
| TIME | Time image last modification information. | 
| TIME_DAY | Image last-modification time day value. | 
| TIME_HOUR | Image last-modification time hour value. | 
| TIME_MINUTE | Image last-modification time minute value. | 
| TIME_MONTH | Image last-modification time month value. | 
| TIME_SECOND | Image last-modification time second value. | 
| TIME_YEAR | Image last-modification time year value. | 
| TRANSPARENCY | Transparency information. | 
| XMP | 
            XML packet containing XMP metadata. 
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            Inheritance Hierarchy
            
            
            See Also