I have been staying quite and following the thread and holding my tongue to see what others might suggest. However, it appears that everyone has neglected the questions dealing with resizing and focused on sharpening. So I guess I have to jump in and ask the difficult primary questions.
First, what do you mean by "resizing" and how are you doing this "resizing?" By "resizing." are you referring to changing the resolution via interpolation methods or keeping the actual original resolutions while increasing or decreasing the lineal dimensions of the image? Second, are you increasing the resolution form the original resolution and from what to what; or are you decreasing the original resolution and from what to what? Third, if you are increasing or decreasing the original lineal dimensions from the original dimensions without changing the original actual resolutions, how are you doing this - by what method in what program? If you are merely changing the lineal dimensions of the image to a new size (namely, scaling the image) without making changes to the actual original resolutions of the image, you will be changing the effective resolution. Increasing the size will result in an effective proportional decrease in the resolution, while decreasing the image scale will result in an effective proportional increase in the resolution. This change in resolution may not be readily known since the effective ppi will change but the actual total number of pixels may not change; they are either just more concentrated or spread out. Should the effective ppi be reduced to 100 ppi or less, the quality and sharpness of the display will be effected, becoming softer in nature and involving fewer pixels to sharpen. Thus, one may need to take this into account when choosing and applying sharpening methods. Most sharpening methods rely on hard straight edges so that nature of the image in question as well as the amount of resolution that it has will impact on the quality of one's sharpening results. If one is engaging in actually changing the resolutions by means of interpolation, then one needs to be aware that different interpolation methods may effect the quality of the image. However, here again, resolutions of 100 ppi or less along with the nature of the image in question will limit the degree of quality sharpening that one can do. Having said that, the issue of sharpening per se can be addressed more accurately. If you are comparing the sharpness of the image on the monitor versus the sharpness of the image when printed on paper, you may find a natural discrepancy between them since the brightness and contrast of the monitor as well as the nature of the type of monitor display will bear on the apparent sharpness that one sees. This also will be effected by the nature of the image along with the low resolutions of most screen displays as compared to their printed versions. Among the various techniques of sharpening other than single-step global sharpening are incremental global sharpening, single-step local sharpening, and incremental local sharpening. All sharpening should be done while viewing a preview display set at 100% of various locations in the overall image in the case of global sharpening or of various locations in the area being sharpened in the case of local sharpening. One can use any one of a variety of sharpening methods (i.e., USM, edge sharpening, LAB Color sharpening, Pixel Genius' Photokit Sharpener, or the like) when employing any of the above mentioned techniques. Typically with USM method, one uses a low threshold of 1-2 and small radius of 1-3 with the actual numbers depending on the type of image. The amount of sharpening depends on how the image appears and on the nature and type of image in question. ----Original Message---- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Wednesday, February 15, 2006 8:16 AM To: [EMAIL PROTECTED] Subject: [filmscanners] Postprocessing - Resizing for screen display > I know this has been asked before so my apologies for going over old > ground! > > When I scan my wife's slides, she normally likes a resized > version for use as desktop wallpaper. My problem is that, > after I resize the images in Photoshop, they either don't > look sharp enough or I manage to oversharpen them and make > them look unnatural. I have tried both USM and the high-pass > filter but just can't get it looking right! The originals > are detailed enough - its just my poor technique. (I'm no > better at resizing my digicam images for the screen.) > > What techniques do list members use to resize/sharpen screen > display images and what USM etc values seem best? I'm > determined to produce an image which my wife actually feels > does the original justice........ > > > TIA, > > > Al > > > > -------------------------------------------------------------- > -------------------------- > Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe > filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) > in the message title or body ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body