Quoting aitor Pe�a Incl�n <[EMAIL PROTECTED]>: > I wish to know which is your workflow to resize the file,for a optimal web > resolution,( which size, if you add a profile (sRGB ), which parameters you > use in unsharp mask. If a " down" stair interpolation will be necesary . > Or any other advice you consider .
Aitor: Were these files that you converted to CMYK? Or are they copies of drumscans that your received after printing? Are they all from the same prepress house or printer? If not there is no doubt in my mind that you are going to have considerable variability in the total ink limit and form of black generation. The more you know about these variables, the better of a conversion you will be able to achieve to RGB. Choose the most appropriate profile for the image and "assign" that to the CMYK file before converting. I personally wouldn't hand off CMYK images to a web designer, as there is a good chance they know very little about how to convert these to RGB. Unless you have some other projects in mind, you might as well convert to sRGB. Do this yourself first, then hand off the files. For that matter, I'd downsample the files to a 1 or 1.5 mb file and let them take it from there. If they don't know what they are doing with the images they should tell you this. If they are drumscans the results will likely have a very "crunchy" appearance. This would indicate that they have had a substantial amount of sharpening (typically USM) applied on the fly depending on the size of the file and the intended output. You may find that a form of stairstep "downsampling" like I decribe at (http://ControlledVocabulary.com/imagedatabases/downsampling.html) works fine without the need for any sharpening in between steps. The sRGB images should be tagged and saved out as TIFF's for the designer. Let them do the final sizing, sharpening (if needed) and saving out as Jpeg. If the jpeg file is or isn't tagged as sRGB it won't make a tremendous amount of difference as the vast majority of internet browsers are not color managed. It may be a useful exercise to take the same image and do several variations, place them in a page and view from several different OS platforms and browsers. The "digizone" chart at http://www.riecks.com/digitalinfo.html may be of use if you do a lot of work by the numbers (note the numbers indicated are for colormatch RGB which is my preferred working space). Hope that helps. David -- Creating an image database? visit (http://ControlledVocabulary.com/) and join the discussion list, or read areview of the Image Info Toolkit utility at: (http://ControlledVocabulary.com/imagedatabases/imageinfotoolkit.html) David Riecks http://www.riecks.com - http://zillionbucks.com =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
