home *** CD-ROM | disk | FTP | other *** search
/ NetNews Usenet Archive 1992 #19 / NN_1992_19.iso / spool / comp / graphics / 9266 < prev    next >
Encoding:
Text File  |  1992-08-29  |  4.0 KB  |  91 lines
  1. Newsgroups: comp.graphics
  2. Path: sparky!uunet!mcsun!sunic!aun.uninett.no!nuug!tedoc!brox
  3. From: brox@corena.no (Bjorn P. Brox)
  4. Subject: pbmplus10dec91, xwdtopnm : white isn't white anymore..
  5. Message-ID: <BtqyyC.s56@corena.no>
  6. Date: Sat, 29 Aug 1992 13:32:36 GMT
  7. Organization: CORENA A/S
  8. Lines: 81
  9.  
  10.  
  11. I posted this directly to Jef Poskanzer for about 3 months ago, with no
  12. responce. This is just to make shure that it is fixed in the next version
  13. of the pbmplus package:
  14.  
  15. I have some problems with xwdtopnm.
  16. Using xmag on the screen shows that white is (0xff00, 0xff00, 0xff00)
  17.  
  18. When I dump a window using "xwd | xwdtopnm >file.pnm" the white color
  19. becomes (0xfe, 0xfe, 0xfe) (sometimes 0xfd..), which looks white, but isn't
  20. white enough... (A PostScript B&W printer gives you a thin shade, you will
  21. also sometimes get some effects using xwdtopnm|ppmtopgm|pgmtopbm.
  22.  
  23. The error shows up when when converting from short to char on the color
  24. table, like in the statement at line 367, where *maxvalP = 255:
  25.     x11colors[i].red =
  26.         (long) x11colors[i].red * (long) *maxvalP / 65535L;
  27. Shows that:
  28.     0xff00*255/65535 = 254
  29.  
  30. I am using an IBM RS6000/320, AIX 3.2, X11R4.
  31.  
  32. senja:brox> xwdtopnm -version
  33. xwdtopnm: Version of 10dec91
  34. xwdtopnm: BSD defined
  35. xwdtopnm: PBMPLUS_RAWBITS defined
  36. xwdtopnm: RGB_DB="/usr/lib/X11/rgb"
  37. xwdtopnm: LIBTIFF defined
  38. senja:brox> 
  39.  
  40. Below is a small uuencoded compressed xwd file you can test xwdtopnm on.
  41.  
  42. begin 664 mailbox.xwd.Z
  43. M'YV0``*N"0C@`$$!!!$0E+&0H,,`!$$0A!A08D"%`6D0'."PHT>,%`&$!,`P
  44. M8,D!ACP&Q'.'3)TV<%0Z-#CQ'P";-FD&%(`-0,]?!1UR))C3(0$Y`#[=#$JP
  45. M`"@`WY;J!&#@!X`K`!@Q#7C`!`"-5+8"0!`&P"$`V<0FP`0`&`!H8A6X`N`,
  46. MP#NQ"\````0`DE@&?``0`L!V:@./4QTXK"+V@<-58B$X+$HP0D#&7!U*N`R`
  47. M\=0)G"%/I<"9<L`*`2%G)F@A=6>Q%UR+=HC!M6D`&0+:7!U0@^[74S?\GDV0
  48. MP^_;'3`3G.I!N6>''Y03KZC\=@C&RJ>*P`[<X0CNTP&0X'Z[!&/58DV<[T[P
  49. MQ/KP*-;?3L%XMU@5]=D'7)$_/(O\M[6`'F\`N(#><P2]@%YX,*!W6PR09>>0
  50. M#!'J!\`,%89'0X6WU0`9>E/9\*&%-XP8'@XCWI8#9/9-I0.+%NX`8W@\P'A;
  51. M#_81Z(-]"`;T@WWA`6'?;4'8)"%!0AAIX1!*AD>$DK<581.(#ADQI85'7!D>
  52. M$E?>E@1.RSFD!)@]`K`$F.$Q`>9M32#FD!,E`!!GG%,]D00`=]XY%11N`-!G
  53. MGU-%(0D`@PXZE12W`)!HHE--L0T`CSXZ%15KBE4%/P"``T`B8EGQ!`"??CK5
  54. M%7/E`D`U8F%QUZIB94$$G@"$-9462M4JUA8I`,`"26)QX=BO8G71"0"U`-",
  55. M6%[\`8"RRD[U!3<`]".50V"\`("UUDX5AA4`D`%`'&*)\0P`XXX[U1@:\0#`
  56. MJU.1\0H`[[X[51F/`%!OO5.9\08`^^X[U1E?`!!PP%.A8=7!8J41U<)BJ?$!
  57. M``\_/-4:0%4L%AMI`!!3(&*U08U/`*`CEAMU`'#'7F*]800`1P#0YE1PT`(`
  58. M+@`4(U8<TN8LEAQM`-!SSU/-85D.+HM%!S(`((WT5'6$`,!`C8AEA]))BW6'
  59. MTU"+A<<>`'#-]51Y8`&`V&)/I4?&:(NU1QNV;,/&/_],Q0?;__A#8!]T^U-%
  60. M%5/YD;<JJDSU1]YP3P6()$C,Y%`@B%_&MT."-`X`X%,-(GGA#A&".`F#BE7(
  61. MYI+L/94AH%/NT"&@8TX0(H@G00*!B;0^WN,$*2*[Z00M(KOJ`3&".-L$-O*[
  62. M+:([Y,CPN`?TR/"\]X6XY%-%\CP2Q1,DR?3)`S#)],U3@K@MVA!8R??:5!^0
  63. M)>1G?PGYS6."N-L$9O(^&^8#H,G\V6\R?_.<(%XW@9WPG]YH%Q!/"#![GQ!@
  64. M\T`!/L41)!0-[`P!`2"*"&9O%!%L'BG`QSD"E8*#H9N@*4"8O5.`L'FH`)_K
  65. M")0*%<YN*JIP8?96X<+FL0)\P!-+*W!(O`FZ@H?9>P4/FP<+\$'/(;$P(O4F
  66. M*`LE9F\62FP>+<`7P:G4@HKEFZ`ML)B]6V"Q>;@`'_S$D@LQTF^"NC!C]G9A
  67. MQN;Q`GS_$TLOX#C`J?B"CMG[!1V;!XPQ$B@88ZR?,,:8O6&,L7G$<%L'Q5(,
  68. M189P*L9P9/:.X<CF(<-M*Q1+,C#Y0H<H@Y/96P8GF\<,M^5P*LTP90^GX@Q5
  69. M9N\9JFP>--QV1()$@Y9+G(HT<)F]:>"R>=1P6Q4=4@UA9G$JUC!F]JYAS.9A
  70. MPVUCG$HVH'G&J6B#FMG;!C6;QPVWQ7$JW?!F'1WB#7%F[QOB;!XXXDB@<,2Q
  71. M?N*(8_;&$<?FD:-NBYQ*.?#Y2(>8@Y_9.P<_FX>.NF5R*NDP:"<)H@Z%9F\=
  72. M"FT>.^IV2H>T@Z*K=(@[,)J]=V"T>?"H6RT#$@^1YM(A\C!I]N9ATN;1HV[#
  73. M)$@]8'I,A]B#IMF[!TV;AX^Z1=,A^?!I-1VB#Z%F;Q]";1X_ZO9-A_2#J>,D
  74. MB#^@FCVX376J<9.)5K?*U:X^)`!@#:M8QTK6LIKUK&#]*EK7RM:VJK6M<(UK
  75. M6-\J5[%VI*YIG0A>YSJ1N\:5KG+5JUT#\E?!UI6P9T4L6P'K5I&LU;&+-2Q<
  76. M%8M6RB96LI']:UDAFU?+/I:SBR6K91EK5L]6%K22):UH/?)9SM)5M8.526D%
  77. MZU>^FG:LF,TM81W+VMB"=K6_Y6MLTQJ2XOKVLZ>UK6UY.UK,#C:SM(TN<(,K
  78. MW-8J%K:=I2Y%?$O9Z-X6M\[-ZVK'VUF(-/:[WP6O<K5[W-E.%K*(9>]R+_O>
  79. MS9Y7N^E]KFCO2]_&VC>R\;UK?JN+V^5^5;4#%J]Z`8Q?^1)8P0SN;V8?;%T)
  80. M(Q?"_'6O?[<[UPAK&+JH]?!F'9Q=D>R6O;T=L5=K:US/IEC%*S9O>8UKUY$0
  81. M-["\[3!Q<WS<AP2XO_'5\7R':V/7<KC`'&9N=ZFK9,.:^,CB_?%N9_S?MZJD
  82. MQTTV\FV;/-T"^_7):DVMB5E,80.7=\SZ?;)YOXQD^P99KV#V\9I+?&+9CAG.
  83. MQ;VRD>G<XBD+.,!WOK&:X7MG--^8P(1FL6MK6V@PR_C1CU:RD`^=Y$2O^-*8
  84. "5@FR
  85. `
  86. end
  87.  
  88. -- 
  89. Bjorn Brox, CORENA A/S, Baneveien 38, N-3600 Kongsberg, NORWAY
  90. E-mail : brox@corena.no, Phone : +47 3 73 66 11, Fax : +47 3 73 68 77
  91.