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Color Correction and Automating Repetitive Tasks

¹ Department of Radiology, Children's Hospital, 300 Longwood Ave., Boston, MA 02115.

View larger version (152K): [in a new window]   Fig. 1A. —"Auto Levels" in Photoshop (Adobe Systems, Mountain View, CA). Original intraoperative image of inflamed appendix has greenish cast caused by fluorescent lights in operating room.

View larger version (103K): [in a new window]   Fig. 1B. —"Auto Levels" in Photoshop (Adobe Systems, Mountain View, CA). "Auto Levels" is found under "Image" menu bar (Image Adjustments Auto Levels), as shown on left side of figure. Note improvement in green cast.

View larger version (122K): [in a new window]   Fig. 1C. —"Auto Levels" in Photoshop (Adobe Systems, Mountain View, CA). "Color Balance" is found under "Image" menu bar (Image Adjustments Color Balance), as shown in left upper corner. Baseline slider bar indicators are set at midline position indicating color level shift of 0 (not shown). Modified "Color Balance" dialogue box is shown in lower left corner. Image midtones have been chosen in "Tone Balance" box. Slider bars for cyan/red, magenta/green, and yellow/blue color levels have been shifted (arrows) to empirically correct color cast. Note change in color levels from 0. Resulting image on right side shows further reduction of green cast and improved exposure of specimen.

View larger version (119K): [in a new window]   Fig. 1D. —"Auto Levels" in Photoshop (Adobe Systems, Mountain View, CA). Photoshop version 7.0 "Auto Color" is located under "Image" menu bar (Image Adjustments Auto Color), as shown in left upper corner. Resulting image on right side depicts true gray color of surgical drapes and flesh tones of appendix.

View larger version (83K): [in a new window]   Fig. 2A. —Blending modes in Photoshop (Adobe Systems, Mountain View, CA). Original image (A) of graph illustrates relationship of intravascular volume loss and cardiovascular response in children; note light color of background. Use of "Multiply" blending mode: Open "Layers" window (Window Show Layers) and duplicate background layer by dragging it to bent page icon at bottom of window (arrow, A) as shown in left upper corner. Blending mode in "Layers" window is changed from "Normal" to "Multiply." Resulting blended image is shown on right. Note darker background and improved contrast.

View larger version (68K): [in a new window]   Fig. 2B. —Blending modes in Photoshop (Adobe Systems, Mountain View, CA). Original image (A) of graph illustrates relationship of intravascular volume loss and cardiovascular response in children; note light color of background. Use of "Multiply" blending mode: Open "Layers" window (Window Show Layers) and duplicate background layer by dragging it to bent page icon at bottom of window (arrow, A) as shown in left upper corner. Blending mode in "Layers" window is changed from "Normal" to "Multiply." Resulting blended image is shown on right. Note darker background and improved contrast.

View larger version (76K): [in a new window]   Fig. 3A. —Creating actions in Photoshop (Adobe Systems, Mountain View, CA). "Actions" palette is selected by clicking "Window" menu bar (Window Show Actions), as shown in upper left corner. "Actions" dialogue window is shown in upper right. Choose "New Action" by clicking on arrowhead at top of box (white arrow). "New Action" dialogue box will appear. Type name of new action in box titled "Name." Leave set as "Default Actions." Click "Record" button (black arrow) to record set of actions.

View larger version (89K): [in a new window]   Fig. 3B. —Creating actions in Photoshop (Adobe Systems, Mountain View, CA). Perform actions you want to record on any open image. Recording function is active when recording button is highlighted (white arrow). Once all actions you wish to record are recorded, click black square "stop-record" button (black arrow). (Fig. 3A, 3B, 3C, 3D continues on next page)

View larger version (101K): [in a new window]   Fig. 3C. —Creating actions in Photoshop (Adobe Systems, Mountain View, CA). To perform recorded actions on multiple images, select "Batch" under File menu (File Automate Batch), as shown on left. Batch dialog window is shown on right side. Select wanted action by clicking on "Action" pull down menu (here, "grey scale" is highlighted).

View larger version (110K): [in a new window]   Fig. 3D. —Creating actions in Photoshop (Adobe Systems, Mountain View, CA). Choose folder on which to perform actions by clicking "Choose" under "Source" (long black arrow). Under "Destination" (short black arrow), choose "Save and Close" option. Click OK button in right upper corner of dialog box. Set of selected actions will be performed on every image in source folder and saved automatically.

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