4. Adjust the gamma value
Tonality: Under normal circumstances, the picture is divided into bright tone, midtone and dark tone. Set the black and white field, the entire image of the tone range is determined, but how to locate the middle tone in this range, that is how to determine the level of distribution is determined by the Gamma value. In general, the tonality of a picture should be as far as possible in the middle tone, because people are more accustomed to looking at pictures with rich midtones.
Gamma: For most scanners, each has its own default Gamma experience for most images. It must be noted that different scanners have different Gamma experience values. When adjusting the Gramma curve, it has a great influence on the tone of the entire picture. Only those with a certain scanning experience can use the curve to make beneficial adjustments to the specific picture. Otherwise, it will be self-defeating. Instead, it should choose its default linear Gramma curve instead.
5. Repeated test
Do not worry about making test items while scanning. If you are not satisfied, scan again, and experience is the basis for a successful scan. Repeated trials are unavoidable. Fine adjustments are made to the scan settings, and then compared to the scanned image results. When an ideal combination of settings is found, it is recorded on paper or saved in software, not only with accurate data, but also Can cultivate the observation and judgment of the scanning operation.
Among the several input indicators of the scanner, bit depth, black/white field calibration, parameters such as Gramma, etc. mainly affect the image hierarchy, and resolution, filters and other tools mainly affect the fine level of the image. Although most scanners have different menus, the basic control parameters are the same, and there are constant black and white fields and gamma values, tone adjustments, and analysis of manuscripts. This is a key factor in the quality of the scan.
Four, special picture scanning skills
1. Print scan to moire
1 In the scan to the moire: in all the scanning interface has a moire feature, select this feature can remove the image of the moire.
2 In Blusher's Filter menu, select Gusilla Blur in Blur, take a value of 1, blur the image, or use Medianb in Noise, but it will make the image more blurred, not as good as Guosian Blur. Despeckle in Noise has a weaker moiré pattern and is generally used for grayscale images.
3 Single-channel moiré, the Y-channel in the four channels of CMYK is the heaviest one of the moiré, and can be individually treated in the yellow channel to further remove the moire.
4 wire drawing method: scanning with large resolution during scanning, and then drawing processing in Image Size. If you use 600dpi to scan, and then keep the image size and proportion in Photoshop Image Size, set the image resolution to 450dpi, and then repeat again, set the image resolution to the target value of 300dpi.
2. Scan line drawings
Use a high-resolution scan (at least 600dpi) to reduce line jaggies resulting in smoother lines or shapes, ensuring that the output resolution of the linemap equals the resolution of the printer (at least in the printer resolution at the desired print size) When the rate is lower than 1200dpi): Scan resolution = magnification × printer resolution.
3. Scanning translucent objects
When scanning a transparent object, if you use the correct object and correct operation skills, you will get a very interesting scan results. The operating technique mentioned here is not suitable for scanning all transparent objects, but it can almost increase the depth information of any object being scanned (because the object is transparent, so it is difficult to scan according to the normal operation method). The desired advantages can be obtained from the translucency of the transparent object or the ability to reflect light. By superimposing an image scanned in a transmissive manner on another scanned image having reflection information, it is possible to produce a scanning effect that cannot be obtained by performing a separate transmission scan or a separate reflection scan. Combining the information in the two scanned images produces better visual expression.
for example
Use a plastic cup as the object to be scanned. Scanning by reflection can obtain high-medium tone levels that cannot be obtained by scanning in a transmissive manner, and scanning in a transmissive manner can also provide an interesting deflection effect that occurs when light that cannot be obtained by reflection is transmitted through the glass. The plastic cups are scanned in both transmission and reflection, and then the scanning results are superimposed to obtain the most comprehensive scanning information and effects. When synthesizing two scanned images of the same object, do not change the size of the scanned image or rotate the scanned object, otherwise the two scanned images will not be accurately reunited. The steps are as follows:
1. Scan the object with ordinary reflections and place a piece of white paper as the background.
2. The object is scanned again in a transmissive manner to obtain a solid transparent image with a rather solid texture.
3. The two scanned images are placed on two different layers, and the images in the two layers are processed and adjusted appropriately so that the two can be accurately reunited.
Tonality: Under normal circumstances, the picture is divided into bright tone, midtone and dark tone. Set the black and white field, the entire image of the tone range is determined, but how to locate the middle tone in this range, that is how to determine the level of distribution is determined by the Gamma value. In general, the tonality of a picture should be as far as possible in the middle tone, because people are more accustomed to looking at pictures with rich midtones.
Gamma: For most scanners, each has its own default Gamma experience for most images. It must be noted that different scanners have different Gamma experience values. When adjusting the Gramma curve, it has a great influence on the tone of the entire picture. Only those with a certain scanning experience can use the curve to make beneficial adjustments to the specific picture. Otherwise, it will be self-defeating. Instead, it should choose its default linear Gramma curve instead.
5. Repeated test
Do not worry about making test items while scanning. If you are not satisfied, scan again, and experience is the basis for a successful scan. Repeated trials are unavoidable. Fine adjustments are made to the scan settings, and then compared to the scanned image results. When an ideal combination of settings is found, it is recorded on paper or saved in software, not only with accurate data, but also Can cultivate the observation and judgment of the scanning operation.
Among the several input indicators of the scanner, bit depth, black/white field calibration, parameters such as Gramma, etc. mainly affect the image hierarchy, and resolution, filters and other tools mainly affect the fine level of the image. Although most scanners have different menus, the basic control parameters are the same, and there are constant black and white fields and gamma values, tone adjustments, and analysis of manuscripts. This is a key factor in the quality of the scan.
Four, special picture scanning skills
1. Print scan to moire
1 In the scan to the moire: in all the scanning interface has a moire feature, select this feature can remove the image of the moire.
2 In Blusher's Filter menu, select Gusilla Blur in Blur, take a value of 1, blur the image, or use Medianb in Noise, but it will make the image more blurred, not as good as Guosian Blur. Despeckle in Noise has a weaker moiré pattern and is generally used for grayscale images.
3 Single-channel moiré, the Y-channel in the four channels of CMYK is the heaviest one of the moiré, and can be individually treated in the yellow channel to further remove the moire.
4 wire drawing method: scanning with large resolution during scanning, and then drawing processing in Image Size. If you use 600dpi to scan, and then keep the image size and proportion in Photoshop Image Size, set the image resolution to 450dpi, and then repeat again, set the image resolution to the target value of 300dpi.
2. Scan line drawings
Use a high-resolution scan (at least 600dpi) to reduce line jaggies resulting in smoother lines or shapes, ensuring that the output resolution of the linemap equals the resolution of the printer (at least in the printer resolution at the desired print size) When the rate is lower than 1200dpi): Scan resolution = magnification × printer resolution.
3. Scanning translucent objects
When scanning a transparent object, if you use the correct object and correct operation skills, you will get a very interesting scan results. The operating technique mentioned here is not suitable for scanning all transparent objects, but it can almost increase the depth information of any object being scanned (because the object is transparent, so it is difficult to scan according to the normal operation method). The desired advantages can be obtained from the translucency of the transparent object or the ability to reflect light. By superimposing an image scanned in a transmissive manner on another scanned image having reflection information, it is possible to produce a scanning effect that cannot be obtained by performing a separate transmission scan or a separate reflection scan. Combining the information in the two scanned images produces better visual expression.
for example
Use a plastic cup as the object to be scanned. Scanning by reflection can obtain high-medium tone levels that cannot be obtained by scanning in a transmissive manner, and scanning in a transmissive manner can also provide an interesting deflection effect that occurs when light that cannot be obtained by reflection is transmitted through the glass. The plastic cups are scanned in both transmission and reflection, and then the scanning results are superimposed to obtain the most comprehensive scanning information and effects. When synthesizing two scanned images of the same object, do not change the size of the scanned image or rotate the scanned object, otherwise the two scanned images will not be accurately reunited. The steps are as follows:
1. Scan the object with ordinary reflections and place a piece of white paper as the background.
2. The object is scanned again in a transmissive manner to obtain a solid transparent image with a rather solid texture.
3. The two scanned images are placed on two different layers, and the images in the two layers are processed and adjusted appropriately so that the two can be accurately reunited.