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Cultural Heritage in REGional NETworks REGNET Digitising approach (ALI)

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Presentation on theme: "Cultural Heritage in REGional NETworks REGNET Digitising approach (ALI)"— Presentation transcript:

1 Cultural Heritage in REGional NETworks REGNET Digitising approach (ALI)

2 Barcellona Meeting Sam H. Minelli(ALINARI) Jan 2002 Contents Here you will find some suggestions coming from experience and huge efforts. This document is strictly reserved.

3 Barcellona Meeting Sam H. Minelli(ALINARI) Jan 2002 All imagery should be scanned on a drum scanner or a professional level flatbed scanner or back-camera to insure a high quality digital file. A comparison is necessary trough periodical prints such as digital Cromalin. To spare money use a good color ink-jet printer which is more stable.

4 Barcellona Meeting Sam H. Minelli(ALINARI) Jan 2002 Scanning and/or image manipulation should occur on a calibrated monitor with the following characteristics: White Point: 6500º Kelvin, Gamma: 1.8. Files should be scanned and saved in RGB, as TIFF files, with no compression.

5 Barcellona Meeting Sam H. Minelli(ALINARI) Jan 2002 Images that have been digitally composed in Photoshop must adhere to the same quality standards, i.e.: no visible clipping paths or gaps, undetectable use of cloning, proper and professional cleaning, spotting and cropping.

6 Barcellona Meeting Sam H. Minelli(ALINARI) Jan 2002 A digital output of a digital file cannot be scanned to meet good standards of image quality (any post process causes loss).

7 Barcellona Meeting Sam H. Minelli(ALINARI) Jan 2002 If no color correction is possible in a color space larger than 8-bit (i.e. composite images manipulated in Photoshop) care must be taken as to not posterize the image or create out of gamut printing colors. Alpha channels should be removed.

8 Barcellona Meeting Sam H. Minelli(ALINARI) Jan 2002 Image files should be embedded with a profile of the scanner it was scanned on or the color space in Photoshop it was worked on: Adobe RGB 1998 is widely used. The ICC profile is crucial. The whitest point in an image should not exceed a digital value of 252, and the blackest point in an image should not be below 5-6. This can be checked in Photoshop using the Histogram feature. Individual color channels should not be clipped.

9 Barcellona Meeting Sam H. Minelli(ALINARI) Jan 2002 Time is expressed in minutes File size (RGB) Compressed file size 56kISDN 2MB k1-3< 1 15MB1-3MB6-18< 6 30MB2-5MB11-22< 12

10 Barcellona Meeting Sam H. Minelli(ALINARI) Jan 2002 Last but not least: take care of the relation between the size of the image its resolution and the troughput of your connection And … Watermark it, if you want to save it.


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