Introduce several scanning and imaging techniques
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1. Find the best scanning area for the platform scanner
We can find the best scanning area for the scanner, and we should place the image here for the best and most fidelity image.
Ways to find: Set all controls of the scanner to automatic or default state, select all areas, and scan a blank, white or opaque block sample at low resolution. Open the Adobe Photoshop software and process it with the averaging command (Equalize menu item), then you can see cracks, streaks, and black spots on the scanner. We can print this file and cut out the best areas (that is, the most stable areas) to help us place the image.
2. Rotate the image before scanning
Performing the rotation process is a waste of time, and the quality of the image will decrease depending on the angle of rotation. If we know in advance how the image is placed on the page, then using the protractor and the bottom edge of the original to place the original at a precise angle on the drum and platform will result in the highest quality image without having to rotate it in the image processing software. .
3. Optimize scanner resolution
Scan the line draft and match the scan resolution to the output resolution. For example, prepare to use a 600dpi resolution printer output to scan at 600dpi. If possible, scale down large images after scanning. For example, we scan a 4 x 4 inch image at 600 dpi and reduce it to 2 x 2 inches in the setup program, then its resolution is 1200 dpi.
4. Zoom in, soften, and then add noise
If you zoom in on a Photoshop file and want to minimize the quality loss of the image. After zooming in, add 1 or 2 points of Gaussian softening and then add 1 noise. Be sure to check the sawtooth effect in a 2:1 field of view.
5. Scan the dark original
There are many reasons why desktop scanners do not scan well for darker images. Often, adding a little noise is helpful for the dark areas of this image.
6. Eliminate Newton's ring
Newton rings often appear when scanning transmissive originals. Cleaning the scanning roller and platform can reduce its production. But if it still exists, then you should use some simple methods: part of it is to use the duster with corn flour, go to the place where you leave the scanner, squeeze the corn flour out of the duster, let it disperse from the air Open, when the large particles of the powder fall, hold the corner of the transmission and let it pass through the dusting area, so that the fine particles in the air fall on it to achieve the purpose of eliminating the Newton's ring.
7. Keep the selected state when changing the image size
When we change the image size or canvas size in Photoshop, the selection that was activated before the operation is lost. If you want to keep this selected outline, switch to Quick Mask mode before changing the size (press Q or select Quick Master mode in the toolbar). The Image Size command changes the image size along with the mask size. The canvas size change does not affect the selection size. (If you plan to increase the canvas size, first set the background color to black so that the newly created white space is not selected.) When each command is completed, return to the standard mode and restore the option outline.
8. Maximize the color gamut of the scanned image
To maximize the color range of a 30 or 36-bit scanner, you can use a scanner software (such as Agfa's FotoTune or other company's software) to adjust the color as much as possible so that the image can be inserted in the widest gamut range. Because Photoshop software only processes 24-bit images.
9. Combine images for better detail performance
What if the tonal range of the image we are scanning is larger than the range that our scanner or software can adapt to, such as sky clouds or skin tones with a lot of high-light detail, and deep and dark levels?
The best way is to scan the image twice at the same scan resolution. But one image is adjusted to the largest bright detail and the other image is adjusted to the largest dark detail. Open the image in Photoshop and open the layer selection dialog for the layer template, placing the two images on adjacent layers. This dialog gives us the option to mix the images each time we scan (press Option to separate the sliders to make the midtones smoother and more smooth).
If you are using Live Picture software, insert the image into the adjacent layer and use the Insert brush to draw more detail from one layer to the other. This can be done in Photoshop using the Brush and Feather option. Live Picture software's resolution-independent brushes provide fast, natural blending of images even at very high resolutions.
10. Match the size of the new image to an open image
When we create a new image in Photoshop, the program automatically matches the resolution and size set on the clipboard, but we can also match the size and resolution settings of the newly generated image to any open image.
Open the New dialog and go to the Window menu and select the file name of any open file. Photoshop can capture the size and resolution of this image and reflect it in the corresponding new dialog. Similarly, in the Image Size dialog, we can change the size of an image to match another selected file name; or in the canvas dialog, cut a file so that it is selected with another The files match.