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  • efg's Printer Projects -- Printer Demo #1
    bitmap Show Sine Curve the CopyRect Enigma Show List of Fonts Print font name in its own font can be a viewing problem for symbol fonts Draw and StretchDraw use the StretchBlt API call The CopyRect Enigma is so named because of a problem in initially getting CopyRect to work at all with a HP LaserJet 5 When I accidentally coded the flipped image I noticed the graphics were wrong and corrected the image But with the correct orientation the image would not print at all Note the sine curve initially goes down when the direction of the Y axis is reversed Is it possible this is caused by a pfDevice PixelFormat I need to check this 1 Dec 98 efg In a few observed cases with a LaserJet 5 the use of Draw in Delphi 1did not result in any image The same program in Delphi 2 or later resulted in a small image being drawn Physical Page Versus Logical Page The dimensions of the physical page GetDeviceCaps values PHYSICALWIDTH and PHYSICALHEIGHT in dots are larger the the logical page GetDeviceCaps values HORZRES and VERTRES in dots or HORZSIZE and VERTSIZE in millimeters There doesn t seem to be much of a pattern in what manufacturers use for the left and top margins PhysicalOffsetX and PhysicalOffsetY Often the Logical Page is not even centered horizontally and vertically within the Physical page Often with InkJet printers there is much as a 0 5 inch gap at the bottom of a page in portrait orientation or the right of the page in landscape orientation Important GetDeviceCaps Values GetDeviceCaps Parameter Description HORZSIZE horizontal size mm VERTSIZE vertical size mm HORZRES horizontal resolution dots VERTRES vertical resolution dots LOGPIXELSX horizontal dot density dots inch LOGPIXELSY vertical dot density dots inch PHYSICALWIDTH page width dots PHYSICALHEIGHT page height dots PHYSICALOFFSETX horizontal offset from physical page edge to logical page edge dots PHYSICALOFFSETY vertical offset from physical page edge to logical page edge dots Here s a brief description of some of the relationships among the GetDeviceCaps values Horizontal Dimension not drawn to scale PHYSICALWIDTH PHYSICALOFFSETX HORZRES gap Horizontal gap or margin at the right PHYSICALWIDTH PHYSICALOFFSETX HORZRES Example Epson Color Stylus 850 in Landscape Orientation 8 5 by 11 paper GetDeviceCaps Value Dots Inches Dots LOGPIXELSX Millimeters Inches 25 4 PHYSICALWIDTH 7920 11 00 279 4 PHYSICALOFFSETX 84 0 12 3 0 HORZRES 7440 10 33 262 5 gap 7920 84 7440 396 0 55 14 0 Ideally the gap would be the same as the PHYSICALOFFSETX value to center the logical page within the physical page A horizontal gap of 84 dots would have centered the logical page within the physical page horizontally So the page is positioned 396 84 312 dots from being centered On the Epson this is 312 720 0 43 inch Since printing outside of the logical page is impossible there is no way to print anything in this gap area As mentioned earlier many inkjet printers have a

    Original URL path: http://www.efg2.com/Lab/OtherProjects/PrinterDemo1.htm (2016-02-14)
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  • the region near to London Since absolute spectroradiometry was not yet invented the early work need a normalization constant They used the reflectance of a white glass tile from the NPL The range of matches to the white of that tile by about 40 observers all classified by the NPL as color normal spanned about 50 CIELAB color difference units at the white point CIELAB and the MacAdam 1 std

    Original URL path: http://www.efg2.com/Lab/Library/UseNet/1999/1217.txt (2016-02-14)
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  • x 0 625 y 0 340 Green x 0 275 y 0 605 Blue x 0 150 y 0 065 The exception is the 21 Mitsubishi p n 65532 which uses EBU phosphor Gamma Gamma is dependent on a number of things such as emissions of the electron gun color tracking color fluctuation due to brightness level where the user has his her brightness contrast set and transmissivity contrast ratio

    Original URL path: http://www.efg2.com/Lab/Graphics/Colors/DellInfo.txt (2016-02-14)
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  • efg's Color Reference Library -- Color and Computers
    www mddsp enel ucalgary ca People adilger povray gamma html What is Gamma Correction http paulbourke net texture colour gamma Charles Poynton s Gamma FAQ and Color FAQ www poynton com Gamma Correction for Simulation Gamma correction is essential for good quality image generation Angus examines the problems associated with gamma correction focusing on why it is important to simulation in particular Dr Dobb s Journal Sept 1999 pp 30 37 Computer Graphics Principles and Practice pp 564 568 About Gamma Correction http www graphics stanford edu gamma html sRGB Proposal by Microsoft and HP A color space exclusively for CRT and onscreen display www w3 org Graphics Color sRGB A Standard Default Color Space for the Internet sRGB www color org sRGB html Grays Greys 8 bits allows 256 shades of gray In Windows in 256 color mode 20 colors are reserved for display of icons panels etc so only 236 colors are possible When using 24 bit color graphics the shades of gray are represented by RGB i i i where i 0 255 This means there are only 256 shades of gray even with 24 bit color Perceptually Optimized Grayscales www fho emden de hoffmann optigray06102001 pdf Richard Franzen s UseNet Post explaining PseudoGrey which is used to encode more than 8 bits of greyscale within a 24 bit color image Using the technique exactly 1 786 levels of grey can be encoded and decoded The PseudoGrey page Halftones and Scanning Computer Graphics Principles and Practice pp 568 573 Digital Halftones Fortner97 pp 160 171 ICC Profiles Little CMS Color Engine lcms is a CMM engine Implements fast transforms between ICC profiles lcms is a library only for programmers lcms is FREE and does include SOURCE CODE lcms is a standalone engine It doesn t rely on Windows ICM to work International Color Consortium ICC www color org Spec ICC 1 1998 09 File Format for Color Profiles PDF file 797 kb www color org ICC 1 1998 09 PDF Document ICC 1A 1999 04 Addendum 2 to Spec ICC 1 1998 09 PDF file 32 kb http www color org ICC 1A 1999 04 PDF ICC C Header File http www color org icc34 h LCDs LCD chromaticity coordinates as a function of ambient temperature for CyberDisplay active matrix LCD Neugebauer Equations The Neugebauer equations are considered the basic physical model for printing systems Marc Mahy and Paul Delabastita Inversion of the Neugebauer Equations Color Research and Application Vol 21 No 6 pp 404 411 Isaac Amidror and Roger D Hersch Neugebauer and Demichel Dependence and Independence in n Screen Superpositions for Colour Printing Color Research and Application Vol 25 No 4 August 2000 pp 267 277 Phosphors Phosphor Handbook Pseudo Colors See False Colors Red Eye Automatic Red Eye Detection and Correction in Digdital Photographs http research microsoft com en us um people leizhang Paper ICIP04 Lei pdf An Efficient Automatic Redeye Detection and Correction Algorithm http www hpl hp com research isl redeye redeye

    Original URL path: http://www.efg2.com/Lab/Library/Color/AndComputers.htm (2016-02-14)
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  • broken Specrend s author reports the software has been fixed as of March 9th 2003 The webpage s chromaticity diagrams have not been updated however Fyi Given the number of older specrend c s already out there I m not sure whether removing the caution at this time is a good idea or not The webpage doesn t mention there was a problem the C source does You might add a note to MitchellNCharityColorNote txt and leave it for a year or two Thank you again for maintaining a wonderful resource How are your funding challenges working out Mitchell Charity From Mitchell N Charity To Subject Color Library Feedback caveat on specrend s excellence Date Friday November 30 2001 16 49 I think I already mentioned this but just in case I was pointing someone at your http www efg2 com Lab Library Color AndComputers htm FalseColors thanks again for running a delightful resource and noticed this entry Colour Rendering of Spectra excellent article www fourmilab ch documents specrend While indeed a nice article I some time ago realized after much puzzlement that spectrend web page and C program had mishandled the XYZ to RGB conversion by ignoring the location

    Original URL path: http://www.efg2.com/Lab/Library/Color/MitchellNCharityColorNote.txt (2016-02-14)
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  • point x y 31006 31616 Modern computer monitors have adjustable white points though the white point for a nominal compute monitor phosphor set with a monitor white point setting of 7500 k is x y 345 353 Unless the proper transforms are done to shift the image data white point to that of the monitor there is no hope of obtaining a perceptual match Scanners on the other hand typically

    Original URL path: http://www.efg2.com/Lab/Graphics/Colors/MacbethPerceptualDifferences.txt (2016-02-14)
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  • color information in one of the two pixels I tried to interpolated using the neighbor pixel s color information so I can get YUV 444 format data Then I used the formula shown below to converter the YUV 444 data to RGB 888 Y 0 257R 0 504G 0 098B 16 U 148R 0 291G 0 439B 128 V 0 439R 0 368G 0 071B 128 R 1 164 Y

    Original URL path: http://www.efg2.com/Lab/Library/UseNet/1997/1212.txt (2016-02-14)
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  • bellglobal com 993318593 64 229 70 68 Sat 23 Jun 2001 13 49 53 EDT NNTP Posting Date Sat 23 Jun 2001 13 49 53 EDT Organization Bell Sympatico Xref cyclone swbell net sci image processing 20873 1169D20BB161A76B26CB906D Content Type text plain charset us ascii Content Transfer Encoding 7bit Hello kevin YIQ is only used in encoding decoding NTSC composite video For digital you most likely need what is commonly referred to as YUV or more correctly Y CbCr This is the format used in Rec 609 video commonly referred to as D1 video see http home earthlink net janos1 vidpage color faq html Recommendation Coef for red Coef for Green Coef for Blue Rec 601 1 0 2989 0 5866 0 1145 Rec 709 0 2125 0 7154 0 0721 SMPTE 295M 1997 0 2126 0 7152 0 0722 ITU 0 2220 0 7067 0 0713 use Rec 601 for SDTV and SMPTE 295M 4th decimal difference from Rec 709 for HDTV RGB YCbCr Y Coef for red Red Coef for green Green Coef for blue Blue Cb Blue Y 2 2 Coef for blue Cr Red Y 2 2 Coef for red YCbCr RGB Red Cr 2 2

    Original URL path: http://www.efg2.com/Lab/Library/UseNet/2001/0623.txt (2016-02-14)
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