With the popularity of the Internet, a large number of online pictures have emerged. Newspaper editors in the group version for the needs of the layout, it is inevitable to use some online pictures. Some reasons such as copyright removal, online pictures can not be used casually, the main problem is that the accuracy of online pictures is not enough, the pictures are not clear after the newspaper is printed, and even "mosaic" and other issues. How to properly select and process online pictures to ensure their printing results, we will do some discussion here.
There are a variety of online pictures, please pay attention to the following points when choosing.
1. Try to choose some photos with contrast and contrast
Due to restrictions on printing conditions, the number of newspaper printing screens is relatively low, the picture level is poor, and the online pictures are basically small. If the picture level is too rich, printing cannot be expressed. For example, the photos of the afterglow of sunset, the level is very rich, the display is very beautiful, after printing, the effect of the picture will be greatly reduced; and the contrast, contrasting photos, the original layering is not strong, but the difference is not big after printing.
2. Online people photos to choose panoramic or medium-sized photos, use less close-ups
The average person is very sensitive to the face of the person when looking at the picture, so the close-up picture of the face of the person has a high requirement for the level of clarity. If the photo is too small to be expressed, the color of the face of the person after printing is piece by piece, which makes it easy for the reader to feel the quality of the picture is not good. In some panoramic or medium-sized photos, the faces of the characters are small and focus on the movements of the characters, so that the reader ignores some details, and the defects of the pictures will not cause much concern.
3. Use less or no online chart
The chart is relatively intuitive, and the text in the chart is very poor after being output in the image format, and often jagged, so that the reader can not see the content. If you must use the chart, it is recommended that the editor ask the image processing staff to remove the text, re-do the text block in the layout, and put it into the picture. [next]
The size of the online image
Online pictures are different from photographic works. The biggest difference is the size of the picture, and its size determines the quality of the printed picture. In general, the size of the image file is proportional to the size of the image in the newspaper. Because of the network speed and other issues, online pictures are mostly JPEG format, the file size is usually only tens of KB or even a dozen KB, a few KB. Now, the same digital camera saved in JPEG format, 3 million pixels, medium-precision photography, file size is also hundreds of KB. After many attempts, we found that in order to apply online images in newspapers, in general, the image file is required to be larger than 20 KB, and the size of the photo in the newspaper is within 6 cm × 10 cm. In other words, the size of the online image when using it on the layout is preferably the original size (after the resolution is changed to 200dpi), even if it is enlarged, it should not exceed 120%. Such a large picture will not appear too bad in quality when printed. .
Online image processing
Online pictures and photographs are processed in the same way, but the degree of processing is different, the requirements for photo adjustment are higher, and the processing of some details can often determine the final print quality.
1. Save images in TIFF or EPS format
The JPEG format picture takes up less system resources and has a fast transmission speed. It is also useful for prints with low precision requirements such as newspapers. However, JPEG is a picture saving format of lossy compression algorithm. Some data will be lost every time it is saved. This is a disaster for online pictures with few original picture information, but there is no such situation in TIFF or EPS format, so it is saved. Pictures should be used to TIFF or EPS format in order to re-process the image multiple times.
2. Process images in RGB mode and save images in CMYK mode
RGB mode is the color mode adopted by all optical principle-based devices. The color gamut is larger than CMYK mode. Therefore, when processing images in RGB mode, it will get wider color space and more subtle and varied editing effects.
The picture used for printing the film must be in CMYK mode, so the picture mode should be converted before the film is released. It should be noted that some color changes will occur in the picture when the picture mode is converted. The picture in CMYK mode will always be dim than the picture in RGB mode. After conversion, you should observe it first, and confirm that the picture is output without color cast. If you are not satisfied, you should immediately cancel the conversion of this color mode. You must never convert it back to RGB color mode, resulting in irreparable color loss.
3. Sharpening of picture sharpness
Sharpness emphasis (sharpening) is not enough, the outline is unclear, the picture is blurred; the sharpness is over-emphasized, and the outline of the picture is hard. The quality control of the image directly affects the quality of the picture. Online pictures usually have low precision, and the level is not obvious. It is easy to paste. Therefore, sharpening is not a process that can be done or not. It is a part of the pre-press processing of online pictures. It is the most effective means to improve image clarity. For different types of pictures, to find the appropriate level of sharpening from the practice, from the display screen effect, usually the sharpness of the character picture seems to have been a bit too good, but for some landscape pictures sharpening degree can also Bigger. [next]
4. Level and color adjustment of online images
The level adjustment must first meet the printing requirements, and the main level should be concentrated in the middle area, that is, 20% to 60% of the visually sensitive area. Secondly, according to the original content and the hierarchical distribution, the order of the important parts should be ensured, such as clothes and faces. Department, etc.; again, to adjust the value of extremely high light or extremely dark tone, not a large area of ​​the net, generally controlled at 2% to 95%. The color adjustment of online pictures is mainly to keep in mind that news paper has a gradation of 3% to 5%. Adjust some of the dim pictures to be brighter.
5. Proper use of Intellihance filters in Photoshop
Photoshop is an international professional image processing software. Its Intellihance filter uses the interpolation method to magnify and compensate the image, which can increase the resolution and size of a small image. It can be used properly when processing online images. But the Intellihance filter is unlikely to increase the level and color of the image. In addition, there are some special image magnification compensation software such as S-spline, which is similar in function.
A lot of information is warned. It is best not to use or minimize the use of online images when selecting newspaper images. We can often use them in actual work. As long as you choose it properly and handle it carefully, you can also make online pictures work in newspapers.
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