210810 1L2L0X0A_(I), http://farbe.li.tu-berlin.de/AECI.HTM oder
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For links to the chapter A Colour Image Technology and Colour Management, see
Content list of chapter A: AEA_I in English or AGA_I in German.
Summary of chapter A: AEA_S in English or AGA_S in German.
Example content part AEAI of 26 parts AEAI to AEZI: AEAI in English or AGAI in German.
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Example content part BEAI of 26 parts BEAI to BEZI: BEAI in English or BGAI in German.
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Chapter A: Colour Image Technology and Colour Management, Main part AECI1. Introduction and goals.
2. Photos of the image flower motif on slide and negative material with seven exposures
Figure 2 shows seven exposures between under and over exposure on slide and negative film
For the download of this figure in the VG-PDF format, see AEC1L0N1.PDF.
The left and right side show eight figures based on slide and negative film, respectively. On both sides the left top figure is the normal exposure. Then a series of seven figures follows between under and over exposure on both sides. It can be clearly seen, that the series is taken from under to over exposure.
In Fig. 2 the cut points of the black grid define the measure point of the digital rgb data. The data were taken directly from files which are in the Adobe eps-image format. The 8bit data in the range 0 to 255 are used in Fig. 1, 5, 6, and 7. The 16 (=2x8) positions in the later Fig. 5 correspond to the 16 positions in Fig. 2.
Figure 3 shows the linearized images based on slide and negative film on both sides with a the grid.
For the download of this figure in the VG-PDF format, see AEC3L0N1.PDF.
Figure 4 shows the linearized images based on slide and negative film on both sides without a the grid.
For the download of this figure in the VG-PDF format, see AEC4L0N1.PDF.
In Fig. 3 and 4 all linearized images appear now very similar. In addition the result of both the slide and negative film is similar. The simple input-output relation of three rgb data sets as function of the lightness L* leads to this result. It shows the success of the output linearization method for the production of rgb image data which are approximately independent of both the exposure and the film material.
3. Properties of the ISO/IEC-image "flour motif" in the PG-PDF format in four resolutions.
The ISO-test charts AE18 and AE28 in figure 3 and 4 include the ISO/IEC image "flower motif" in two versions based on slide film (sf, AE18) and negative film (nf, AE28). The analog reflective original "flower motif" (about 70cm x 100cm) includes a black and white Siemens-star and test patches.
An equally spaced 16 step grey scale with CIE lightness L* in the range L*=15, 20, 25, ..., 90 was used. The 14 CIE-test colours for colour rendering according to CIE 13.3 include a hue circle and the four elementary colours Red Re, Yellow Ye, Green Ge, and Blue Be (no. 9 to 12) with a high chroma. The taking illuminant was standard illuminant D65. As measuring and taking (viewing) geometry the CIE standard 45/0 degree was used.
Seven different exposures between under to over exposure were used. For the slide film the exposures -1,5, -1,0, -0,5, +0,0, +0,5, +1,0, and +1,5 stops were used. For the negative film the exposures -2,0, -1,0, +0,0, +1,0, +2,0, +3,0, and +4,0 stops were used. The standard Kodak Photo CD process creates the rgb-colour data as function of exposure and for the two film materials.
Figure 5 shows the input - output relationship for slide film sf (left) and negative film nf (right).
For the download of this figure in the VG-PDF format, see AEY1L0N1.PDF.
Figure 6 shows the input - output relationship for slide film sf with the exposure +0,5.
For the download of this figure in the VG-PDF format, see AEY10-6N.JPG.
Figure 7 shows the input - output relationship for negative film nf with the exposure +1,0.
For the download of this figure in the VG-PDF format, see AEY11-5N.PDF.
By output linearization of the standard rgb values of the Photo CD the intended ergonomic relationship was reached, see the dashed black line. The three relations for the rgb data are nearly perfect, and are therefore located behind or near the dashed line.
Fore more information about output linearization see the Reportership Report CIE R8-09 (download only available for CIE members) or a paper for free download of the CIE author K. Richter with approximately the same technical content, see
Figure 8 shows the flower motif for slide film with the exposure +0,5.
For the download of this figure in the VG-PDF format, see AEC61-3N.PDF.
Figure 9 shows the flower motif for negative film with the exposure +1,0.
For the download of this figure in the VG-PDF format, see AEC71-3N.PDF.
Visual inspection leads to te result that it is hard to see differences between the film material slide film (sf) and negative film (nf). This is similar for exposure variations of slide film in the range between -0,5 and +1,5 stops, and of negative film in the range between -1,0 and +3,0 stops.
The exposure range is about four stops for negative film and two stops (half) for slide film. The output linearization method produces in this exposure ranges images which appear approximately identical.
For other resolutions and in addition images with cmyk instead of rgb data go to the image part AEES.
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