Lyson have the following solution in the document 'Colour Management 2002' Apologies to listmom and all if this is too long, be gentle its my first posting :-)
Problem: The printer lays down dots across the entire page, even over areas of white where I know from the info pallette that there is no information. Cause: The printer can sometimes lay a faint �wash� of colour, usually cyan, over the entire page because of a variety of reasons. Some of the profiles on the Lyson website have been extensively edited to achieve the best possible colour accuracy. The software that writes the profiles occasionally looses the white point after a number of edits. Alos, some engines make a better white point than others. If you are experiencing this problem you can check whether the profile is adding colour into the whites by creating a new RGB document and filling it with white (RGB: 255, 255, 255). Then go to IMAGE-MODE-PROFILE TO PROFILE in PS5 or IMAGEMODE- CONVERT TO PROFILE in PS6/7. Select as the destination profile the printer profile you are using and click OK. With the Info Pallette open you can see any change to the absolute white being made by the profile, usually a drop to a value of 254 in one or more of the RGB channels. Ignore the CMYK values. What do do: Photoshop 6/7 users can go to EDIT-COLOUR SETTINGS. If you have a choice of conversion engine options other than ADOBE (ACE) try changing the engine to �Kodak� . This engine often makes an absolute white point when other engines do not. However this engine is usually only found on Macintosh installations. For reliable results in these cases you can apply the profile in Photoshop before printing. Once you are happy with your image on the monitor save your file then go to IMAGE-MODE-PROFILE TO PROFILE for PS5, IMAGE-MODE-CONVERT TO PROFILE for PS6/7. Select the printer Profile you were using as your destination profile, Perceptual as the rendering intent, and do not select �Black Point Compensation�. Use the Adobe (ACE) engine. Click OK. Once the profile is applied you can then correct the white point of your image. Check the RGB values in the info pallette after the profile conversion for the lowest value when your pointer is over a white point in the image ( it should not go any lower than 253, absolute white is 255 ). Then go to IMAGE-ADJUST-LEVELS. Select a colour channel that is not achieving an absolute white. At the top of the dialogue box there are three boxes for the input levels, 0, 1, 255. Double click on the 255 value and change it to the lowest value in the info pallette, eg, 254. This makes a new white point for your image. Repeat for any other RGB channel you need to correct. After this correction is applied there should be an absolute white point of 255,255,255 in your info pallette. Print this file with �No colour Adjustment� selected in the printer driver and no ICC profiles selected anywhere else in your workflow. In FILEPRINT for PS5 this means selecting �RGB COLOR� in the space option, in PS 6/7 this is selecting �Same As Source�. Your image will then print as it looked on the screen before you applied the profile, with no coverage in the white areas. You can save your images with the profile applied and the white point corrected but be sure not to overwrite your original. Caroline Shipsey =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
