| 5 |
< *Koptekst 3L *OpsomtekenO ³ Swiss ÿÿÿÿ h 3 r h 3 r Ð Ð \ c e f d \ c D e f L d ý . ÆA [Paint Data Section]Paint Data SectionThis section contains all the data of a picture. Size Description L Size of «Paint Data Section» (including this long) L Offset within «Paint Data Section» of pixel data. Always 28 00 00 00 ? L X Size of picture in dots L Y Size of picture in dots «Length» XSize of the picture in twips. 00 00 00 00 means unspecified. «Length» Y Size of the picture in twips. 00 00 00 00 means unspecified. L Number of bits in a dot. Usually 02 00 00 00 L Always 00 00 00 00 ? L Always 00 00 00 00 ? L 01 00 00 00 if RLEencoded, 00 00 00 00 if plain data L (CA) Always FF FF FF FF ? L (Ca) Always 44 00 00 00 ? Pixel dataThe two longs marked (Opt) are only found in a «Clip Art File». Their use is unknown. They are not included in the size of the section (first long) and the offset of the pixel data(second long): you should add 8 to both of them.RLE encoding consists of sequences of marker bytes with data bytes. A marker byte of 00 to 7F means that the next byte should be repeated that many times and once more. A marker byte of 80 to FF means that (100-marker) bytes of data follow.Though all lines have the same length, this length can be a little larger than the picture X size. The remaining padding should be discarded. The length of a line is always a whole number of bytes (after RLEdecoding).Each byte can encode several pixels. The number of bits per pixel is usualy 2, and I presume only values of 1, 2, 4 and 8 are valid. If others are valid, I do not know how they are exactly stuffed into bytes.If the number of bits per pixel equals 2 (I never saw a file wich had another value), each byte encodes four pixels. A pixel is two bits wide, and can range from black to invisible: Value Color 0 Black 1 Dark grey 2 Light grey 3 InvisibleThe lowest two bits are for the leftmost pixel, the highest two bits are for the rightmost pixel: Bits Pixel 0,1 Leftmost 2,3 Left middle 4,5 Right middle 6,7 Rightmost ð " Courier New ð "Times New Roman " Courier New" 1 8 L I I 2 ; ç ñ Û Ñ ¶ b |
Parent Directory
| 
Revision Log