When you begin to create a new slide in PhotoFinish, go to "File," "New" in the drop-down menus. Set the Width to "4096 pixels," the Height to "2704 pixels," and the Mode to "24 bit color." Go to "Image," "Resolution" in the drop-down menus and set the horizontal and vertical settings to "372" and the units to "pixels." Since 35mm film is black, you should make the background black. You may then create your image or import your photo. If you are scanning an image, remember that the final image size does not need to be larger than 4096 pixels wide by 2704 pixels high, as larger files contribute nothing to the sharpness of the image on 35mm film. If you do not have enough memory installed to have such a large image open, set the width to "2048" and the height to "1352;" the image on the 35mm film will be a tiny amount less sharp, but it will still be very good. Smaller or different shape images will be scaled until they fit to one dimension, and there will be black background on the other two sides.
When you save your file, go to the drop-down menu in the upper left of your screen; choose "File," then "Save," and save the file as a Targa .tga file, subformat "compressed."
Photographic Specialties is no longer producing slides and transparencies. I have been self-employed for 35 years, but looking forward to retirement since my wife died five years ago. With the decline of conventional photography and the recent recession, the availability of film and chemicals as well as the volume of work has declined to such an extent that it is no longer possible to have fresh chemicals to develop film. I hope that if you still need conventional slides and transparencies, you will be able to find someone who can produce them for you. Thank you for your orders over the years.