On 12/30/03 4:07 PM, "Patrick Baldwin" <[EMAIL PROTECTED]> wrote:
>> I have always understood that interpolation should be avoided at all >> costs, but this view makes me wonder whether my D100 images would be >> suitable for full A4 with bleed CMYK reproduction at 360dpi (175 lpi) The printing industry is rife with theories but here is the prevailing wisdom. The edict that the file should be twice the resolution of the screen frequency is not hard and fast. The main reason for the increased resolution at all is to prevent the screen from interfering with the pattern of the pixels (moire) and other artifacting. A multiplier of as low as 1.3 times the screen frequency will still yield excellent results. At 1.5 times the screen frequency, the file is indistinguishable from the same size image at twice the screen frequency. So your first move should be to lower the resolution without resampling to 262.5 dpi (175 lpi x 1.5). The resulting change should get you at or close to the needed image size without interpolation. If you wish to res up your files it is best (if possible) to shoot raw and open them in Photoshop using Camera Raw plugin. The raw file which needs to interpolated anyway to be processed into a tiff, can be res(ed) up larger than its native size interpolating once only and thereby making a cleaner file. I have gotten excellent full page results even with a D1 (smaller file than your D100) using this technique =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
