it.med.harvard.edu/ris UMAX Flatbed Scanner Pathology

Transcription

1 it.med.harvard.edu/ris UMAX Flatbed Scanner Pathology

2 Research Imaging Solutions it.med.harvard.edu/ris Beth Beighlie Digital Imaging Coordinator Research Imaging Solutions Information Technology Department Harvard Medical School 220 Longwood Avenue Goldenson 521a Boston, MA (617) Written by Beth Beighlie Copyright 2006 by Research Imaging Solutions July 2006

3 THE UMAX FLATBED SCANNER WITH SILVERFAST DRIVER... 1 SCANNING WITH SILVERFAST... 1 General Tab... 1 Frame Tab... 2 PreScan Preview Window... 2 Resolution Chart... 4 RESIZING IMAGES... 5 REDUCING THE RESOLUTION OR PHYSICAL DIMENSION (RESIZING BY RESAMPLING)... 5 INCREASING RESOLUTION OR PHYSICAL DIMENSION (RESIZING BY ROBBING PETER)... 6 To increase physical dimension (which will reduce the resolution):... 7 To increase resolution (which will reduce the physical dimension):... 7 If you need to increase all dimensions:... 8 RESIZING WITH THE CROP TOOL... 8

4

5 The UMAX with SilverFast Driver If you aren t familiar with the scanning process and issues with resolution, file type and color mode it would be helpful for you to read the Imaging Essentials document. Find Imaging Essentials at it.med.harvard.edu/ris *Items marked with an asterisk are attributes that should be set according to circumstances particular to your input source and output needs. Reading the Imaging Essentials document will aid in determining these circumstances. Scanning with SilverFast A. Start SilverFast Scanner driver by starting Adobe Photoshop. From the Menu Bar go to File > Import > SilverFast (UMAX ). You can also open the SilverFast driver by clicking on the SilverFast icon in the Dock or locating it in the Applications folder. B. Place your artwork face down on the scanner glass, being careful not to cover the calibration window (the thin strip of glass that is near the front of the scanning bed). General Tab C. Using the SilverFast controller, set your attributes, beginning with the General tab Really, all you might need to change is what your Original artwork is. Reflective is for all opaque scanning materials and Transparency is for gels, radiographs and other transparent originals. (As far as the other attributes go, leave the Device on Firewire; Scan Mode as Normal (File); Pos./Neg. as whatever is appropriate) 1

6 Frame Tab D. Begin setting your Frame tab attributes: Scan Type should be set depending on your originals: If your original is color, Scan Type should be 42 -> 24 bit color; If your original is grayscale (like radiographs, black & white photos or any original that is absent any color), Scan Type should be 8 bit grayscale; If your original is strictly black and white line art (no grays: printed text, line drawings, only black-black and white-white), Scan Type should be 1 bit line art. Filter: None. You can make these edits once in Photoshop. Setting: Save Image Type: Standard Since this is a Prescan, you need not do anything else. E. Click the Prescan button PreScan Preview Window F. In the resulting Pre-Scan window, draw a selection around the area you would like to keep as your final scan If there seems to be multiple selection marquees visible, you can remove them by selecting them and clicking on the Delete Selection Marquee button. 2

7 Frame Tab G. Finish setting your Frame Tab attributes. 1. Name your file 2. Confirm the scale to be 100% 3. Confirm that the proportions are constrained by links being intact at right of Scale % area. 4. *Set the resolution for your scan 5. Press Return on your keyboard *Set the resolution of your scan according to the requirements of your output. A chart for the resolution requirements can be found later in this document or in the Imaging Essentials document at it.med.harvard.edu/ris Resizing instructions are also later in this document. For your master file, set your resolution as high as your most demanding output requirement. From that master file, you can make lower resolution versions according to the requirements for each output need H. Save these high-resolution master scans safely to a cd and / or server. I. Open copies of your master scans in Photoshop and start editing. 3

8 Resolution Chart The following is a guide for the output resolution requirements of different devices. It is advisable to acquire images at a higher resolution (i.e.: 400 dpi for photo, bitmap or raster images and dpi for line art, illustrations, cartoons and text) and save that as your master image and make lower resolution iterations according to how you ll be outputting it. Sorry, one size doesn t fit all- you will need different sized images for different output needs. Be careful! Don t overwrite your master images with your dumbed down versions! Output Device Art Work Type PowerPoint On-screen Presentation LCD Data Projector Computer Monitor/Display Web Site Physical Dimension of PowerPoint On-Screen Presentation: 7.5 x 10 otherwise physical dimension of projector or monitor = pixel dimension of device Laser Printer (LaserJets & LaserWriters) Printable Area varies Photo Images Bitmap Images Raster Images (with no text or vector objects within) Raster images that contain Line Art Illustrations Vector Objects Cartoons Text 100 dpi 200 dpi dpi dpi Photo- Quality Inkjet Printable Area varies Photo-Quality Printer (i.e.: Fujix, dye sublimation printers) Printable Area = 8 x 10.5 or 8 x 5 Poster Printer Printable Area =determined by service bureau 150 dpi (plain paper) 180 or 240 or 320 dpi (photo paper) dpi (usually 320 dpi) dpi start at 125dpi dpi dpi 300 dpi If you are scanning 35mm slides or negatives, you should scan at a high enough resolution (at least 1200 dpi at 100%) to be able to resize to a larger physical dimension. Follow the instructions in this document how to properly enlarge the image. This chart is to be used as an approximate guide only- there are more precise numbers that can be applied for specific uses. If you d like to know these specific calculations, use these numbers as starting points and experiment. The goal should be to have a relatively high-resolution master image from which you prepare a file that is the correct resolution, physical dimension and file format for a particular output device. This is especially important when prepping images for insertion into PowerPoint: DO NOT use PowerPoint to resize your images once you have inserted them. 4

9 Resizing Images Reducing the Resolution or Physical Dimension (Resizing by Resampling) A. Open the Image Size dialog box from the Menu Bar: Image->Image Size... B. Make sure the Constrain Proportions and the Resample Image boxes that are at the bottom of the dialog box are checked. C. In the Document Size section of the dialog box, choose the units that you are most comfortable with (pixels, inches, cm, points, etc). D. In the Document Size section, reduce the document s Width or Height. You need only change one dimension. Since the proportions are constrained the other dimension will be automatically calculated. E. Also in the Document Size area, reduce the Resolution according to the ultimate output (refer to Output Devices section of this document or see the Imaging Essentials document which can be downloaded at it.med.harvard.edu/ris). F. Click OK NOTE: When reducing the image size or resolution there is no loss in quality. Increasing the image size or resolution will diminish the quality of the image if you don t do it correctly. If you do need to increase the dimensions of the image, it is recommended that you rescan the image at the higher resolution and/or dimension, or resize the image according to the following suggestions: 5

10 Increasing Resolution or Physical Dimension (Resizing by Robbing Peter) Increasing the resolution or physical dimension of a pixel-based image is generally discouraged. If you must increase the resolution or physical size of an image and cannot rescan or reacquire it to meet your needs, then here s a possible solution: You can force Photoshop to do the calculation that allows you to increase either the physical dimension or the resolution. To do either of the following, you must have an excess of either resolution or physical dimension, because you will be appropriating those excesses to the other dimensions. Here s what s happening: Increasing the Width, Height or Resolution with the Resample Image box unchecked will result in the calculated decrease of the other two dimensions. Read further to see how to properly increase the resolution or physical dimension of your image... 6

11 To increase physical dimension (which will reduce the resolution): For example, this would be appropriate for changing small-dimensioned, high-resolution images to be ready for LCD projector presentations. A. Image->Image Size ; B. In the Document Size section of the dialog box, choose the units that you are most comfortable with (pixels, inches, cm, points, etc); C. Check the Constrain Proportions Box; D. Uncheck the Resample Image Box; E. Decrease the resolution to the target resolution. (Photoshop will do the calculation that will increase the physical dimensions proportionally. The file size will remain the same.); F. Put the checkmark back in the Resample Image Box and enter your target physical dimension into one of the Width/Height boxes (the number you enter must be smaller than the numbers that currently exist in these fields); G. Click OK To increase resolution (which will reduce the physical dimension): For example, this would be appropriate for changing large-dimensioned, low-resolution images to be ready for higher resolution output demands like laser, photo-quality printers or journal submissions. A. Image->Image Size ; B. In the Document Size section of the dialog box, choose the units that you are most comfortable with (pixels, inches, cm, points, etc); C. Check the Constrain Proportions Box; D. Uncheck the Resample Image Box; E. Increase the resolution to the target resolution. (Photoshop will do the calculation that will decrease the physical dimensions proportionally. The file size will remain the same.); F. Put the checkmark back in the Resample Image Box and enter your target physical dimension into one of the Width/Height boxes (the number you enter must be smaller than the numbers that currently exist in these fields); G. Click OK 7

12 If you need to increase all dimensions: You will find moderate success in increasing the resolution and/or physical dimensions by this method. Ideally, you should try to reacquire your image to meet your needs, but if that is not possible try this: If you have an image that is both small-dimensioned and low-resolution, and therefore it lacks the dimensions to Rob Peter in the steps previously described, you can try increasing the resolution / physical dimension in 10% increments by resizing by resampling: A. Open the Image Size dialog box from the Menu Bar: Image->Image Size... B. Make sure the Constrain Proportions and the Resample Image boxes that are at the bottom of the dialog box are checked. C. In the Document Size section of the dialog box, choose the units that you are most comfortable with (pixels, inches, cm, points, etc). D. In the Document Size section, increase the document s physical dimension or resolution no more that 10% larger than the original size. E. Click OK F. Repeat steps A-E until desired size is reached; G. Put the checkmark back in the Resample Image Box and enter your target physical dimension into one of the Width/Height boxes (the number you enter must be smaller than the numbers that currently exist in these fields); H. Click OK Resizing with the Crop Tool To resize with the crop tool, you must be reducing the resolution and / or the physical dimension of your image. If you need to increase either the physical dimension or resolution of your image, you must have an excess of either resolution or physical dimension, because you will be appropriating the excesses to the other dimensions. If you need to increase both the resolution and physical dimension of your image, follow the instructions outlined on the previous page You can resize a selected portion of an image by using the Option Bar with the Crop Tool. Insert the desired physical dimensions and/or resolution in the Option Bar- these numbers will remain for every image you open so you can crop uniformly for creating composite images. You do not need to fill in each field, you can leave any two fields in this Option Bar blank. To return to manual cropping with no preset numbers, press the Clear Button in the Option Bar. 8