it.med.harvard.edu/ris UMAX PowerLook 1120 WQGF
Research Imaging Solutions RIS@hms.harvard.edu 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 02115 (617) 432-2323 b2@hms.harvard.edu Written by Beth Beighlie Copyright 2006 by Research Imaging Solutions September 2006
The UMAX with VueScan 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. A. Place your artwork face down on the scanner glass, being careful not to cover the scanner calibration strip. (At the very bottom of the glass you will see a ruler. Beneath that, you will see a strip of clear glass- this is the calibrator. Do not cover it with your artwork. The top edge of the document (as you would be looking at it while reading it) should align along the edge of the ruler along the bottom. B. In the Dock, find the VueScan icon and open the application: 3
Input Tab C. Set your attributes, beginning with the Input tab 4
Input Tab Attributes These aren t the topmost options, but you need to start with these attributes: Options should be set to Advanced Scan from Preview: None Then set the following Input attributes thusly: Task: Scan to File Source: PowerLook 1120 *Mode: Flatbed for opaque artwork; Transparency for gels, radiographs, acetates or anything you want to project light through *Media: Select Image if your original is opaque, Slide Film if your original is transparent. Bits per pixel: Auto for all but line art (black and white, no gray). If line art, choose 1-bit B&W. Preview Resolution/ Preview dpi: 60 *Scan dpi: This option is not available if you have Scan from Preview Selected. Be sure to set Scan from Preview to none. 400 dpi for photos; 600 1200 dpi for cartoons, illustrations, drawings or text From these high-resolutions master scans, make copies that have the appropriate resolution for your output device (see Imaging Essentials Resolution Chart). Whenever possible use original vector based artwork when inserting cartoons, illustrations, drawings or text into your presentations or publications. Scanning this kind of artwork dramatically reduces the quality of the image. Rotation: None (scan your images so you don t have to rotate them- rotating them can reduce the quality of the image) Mirror: Unchecked Auto Save: Scan Auto Print: None Number of Passes: 1 Scan from Preview: None Long Exposure Pass: Unchecked Exposure Clipping: 0 Lock Exposure: unchecked Options: Advanced 5
Crop Tab D. Set your attributes in the Crop Tab This isn t the topmost option, but you should start with this attribute: Options should be set to Advanced *Crop units: inch, or whatever you re most comfortable working with Auto offset: unchecked X & Y offset: disregard Auto rotate: unchecked Crop Size: manual Lock Aspect Ratio: Off X & Y size & images, Border, Buffer: disregard Preview Area: Maximum Options: Advanced 6
Filter Tab E. Set your attributes in the Filter Tab Do not use any filter, noise reduction or sharpening options. These types of edits should be done in Photoshop. 7
Color Tab F. Set your attributes in the Color Tab This isn t the topmost option, but you should start with this attribute: Options should be set to Advanced Color Balance: White Balance Black & White point and all Brightness options, leave at default Slide Vendor, Brand & Type: disregard Scanner color space: Built-in Printer Color Space: srgb Film Color Space, ICC Profile, ICC Description, IT8 Data: disregard Show IT8 outline: unchecked Output Color Space: srgb Monitor Color Space: Apple RGB View color: RGB Pixel colors: unchecked Options: Advanced 8
Output Tab G. Set your attributes in the Output Tab This isn t the topmost option, but you should start with this attribute: Options should be set to Advanced Printed Units: inch Printed Size: scan size *Magnification: 100%, unless you have reason to do otherwise Auto file name: unchecked TIFF file: checked (Save images as TIFFs, it s a higher quality file format than.jpg) TIFF file name: whatever TIFF size reduction: 0 TIFF multipage: whatever makes sense *TIFF file type: 24 bit RGB for color photos or line art 8 bit Gray for b&w photos or grayscale images 1 bit B&W for line art or strictly black and white (no gray) TIFF compression: off TIFF profile: check Next 5 boxes: uncheck, unless you have specific need for those formats Default folder: Users / temp file will be deleted weekly (this is where you find your scans) 9
H. After setting your attributes, click on the Preview Button I. Set the crop by drawing a selection around the area you wish to scan J. Click on the Scan button K. Find resulting scan in / Users / Desktop / temp file will be deleted weekly L. Save these high-resolution master scans safely to a cd and / or server. M. Open copies of your master scans in Photoshop and start editing according to the needs of your output device (see resolution chart on next page) 10
Resizing Images 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 600-1200 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 125-225 dpi 300-600 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) 300-400 dpi (usually 320 dpi) 125-225 dpi start at 125dpi 300-600 dpi 600-1200 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. 11
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: 12
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... 13
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 14
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. 15