Managing and maintaining data flow is one of the most challenging tasks in the printing industry today. Whether it is screen printing or output to a digital color printer, the efficiency and accuracy of the printing job depends largely on how the digital file is managed and transferred throughout the process.
When we convert analog-original manuscripts into digital files, we are faced with many complicated and complicated digital processes and digital elements. The process of generating and transferring files is also prone to errors, making the management and transmission of digital files the most ideal for printing jobs. The link to the problem.
I. Frequently Asked Questions 1. Font problems include loss of printed fonts in documents, inappropriate font substitution, inconsistent spacing between characters and symbols, placement of symbols, differences in the structure of fonts provided by major software developers, font types (such as Differences between POSTscript, TRUE TYPE, MULTIPLEMASTER).
2. Complex image processing problems The processing of complex image files with multiple elements and layers is a headache. When saving and transferring documents, all image content and elements of the design manuscript must be included in the document in accordance with the designer's requirements. When processing image files, it is often found that one or more images that should be included in the electronic file are missing or need to be updated. When the elements in the design manuscript are changed, the sleeping diameter of the file connection may also be lost. Therefore, only the image seen from the display screen is insufficient to ensure that the original is correct and complete. The more image elements in the original, the greater the chance of error.
Even if the elements of the image are processed carefully and correctly, when the image file is transferred to an imagesetter or a digital printer, some difficult-to-interpret problems still occur, such as image movement and distortion. Sometimes, the root cause of this problem is that the original file is not the same as the version of the application software used to open and output the file. If you want to import ILLUSTRATOR or FREEHAND vector image files into PHOTOSHOP, problems often occur. For example, the imported EPS bitmap image is lost for no reason. In all these cases, what the traditional method can do is to check whether it is consistent with the original by print or output film.
3, file transfer problems Sometimes need to send electronic files through E-MAIL, INTERNET, MODEM (modem), and simply do not know whether the file sent to the other party can open, transfer the content is complete and correct.
4. Compressing and decompressing files Problems are also prone to problems during compression and decompression of files. If lossy compression does not guarantee that the image quality is not damaged, it can only be seen at a glance if the separation film or the color print is released. Often a picture may use a series of compression methods. When you open a file for decompression, you naturally want to use a similar master method and extract the files in reverse order.
Today, image files are getting larger and larger, and transferring files has become a “bottleneckâ€, especially for large-format color images, which can reach 450MB or even 1GB. In addition, although the FRACTAL compression method is a viable lossless compression, it still faces the problem of reading from magnetic media or optical media.
5. Incompatibilities between platforms In the past few years, the incompatibility between MAC, PC, UNIX, WORKSTRATION and personal systems has rarely been mentioned, but it does affect the efficiency of prepress work.
The ADOBE PDF workflow came into being under this background.
Second, PDF can solve the above problem PDF is a platform-independent file format that is suitable for various data compression methods. It can transfer files between different platforms, networks, and INTERNET without worrying about whether the contents of the files are distorted. Using the PDF file format, the previously mentioned issue of turning off fonts was solved, and the imported image files did not undergo any errors during the entire prepress process. In short, using PDF can achieve a true sense of what is seen. Income"!
Third, the PDF file's compressed PDF workflow converts continuous tone images, vector images, bitmap images, and fonts into POST script code, then uses DISTILLER to compress and edit the code to convert the file to PDF format, resulting in a PDF file before conversion. The file is much smaller.
An important feature of PDF is the ease and flexibility of file information compression. The same file can compress different types of data with different compression stages, making the file as small as possible, with little or no image quality. ACROBAT's compression menu provides four compression methods: JPEG, LZW, ZIP, and RUN LENGTH ENCODING.
JPEG: This compression method has five optional compression stages and is a lossy compression. The greater the degree of compression, the greater the loss of image quality. JPEG provides the largest compression ratio, so the file can be minimized. JPEG is suitable for data compression of continuous tone images.
LZW: This compression method is a LEMPEL-ZIV-WELCH (LZW) data compression algorithm, which is a lossless compression, suitable for single-color compression of the original, but also ideal for vector image compression. LZW is not suitable for continuous image adjustment because LZW generates larger files.
RUN LENGTH ENCODING: The most common example of this method for compressing monochrome accommodation is to compress a black and white text file. RUN LENGTH ENCODING is a lossless compression that produces smaller files.
The POSTscript image has three kinds of color bitmaps, grayscale bitmaps and monochrome bitmaps. Using ACROBAT, different compression methods can be used to compress different types of images. In ACROBAT, we can also set DOWN SANPLING RESOLUTION values ​​(according to the specific application), set automatic selection or artificially select compression methods. It must be noted that the different compression stages for different types of images are different. (To be continued)
When we convert analog-original manuscripts into digital files, we are faced with many complicated and complicated digital processes and digital elements. The process of generating and transferring files is also prone to errors, making the management and transmission of digital files the most ideal for printing jobs. The link to the problem.
I. Frequently Asked Questions 1. Font problems include loss of printed fonts in documents, inappropriate font substitution, inconsistent spacing between characters and symbols, placement of symbols, differences in the structure of fonts provided by major software developers, font types (such as Differences between POSTscript, TRUE TYPE, MULTIPLEMASTER).
2. Complex image processing problems The processing of complex image files with multiple elements and layers is a headache. When saving and transferring documents, all image content and elements of the design manuscript must be included in the document in accordance with the designer's requirements. When processing image files, it is often found that one or more images that should be included in the electronic file are missing or need to be updated. When the elements in the design manuscript are changed, the sleeping diameter of the file connection may also be lost. Therefore, only the image seen from the display screen is insufficient to ensure that the original is correct and complete. The more image elements in the original, the greater the chance of error.
Even if the elements of the image are processed carefully and correctly, when the image file is transferred to an imagesetter or a digital printer, some difficult-to-interpret problems still occur, such as image movement and distortion. Sometimes, the root cause of this problem is that the original file is not the same as the version of the application software used to open and output the file. If you want to import ILLUSTRATOR or FREEHAND vector image files into PHOTOSHOP, problems often occur. For example, the imported EPS bitmap image is lost for no reason. In all these cases, what the traditional method can do is to check whether it is consistent with the original by print or output film.
3, file transfer problems Sometimes need to send electronic files through E-MAIL, INTERNET, MODEM (modem), and simply do not know whether the file sent to the other party can open, transfer the content is complete and correct.
4. Compressing and decompressing files Problems are also prone to problems during compression and decompression of files. If lossy compression does not guarantee that the image quality is not damaged, it can only be seen at a glance if the separation film or the color print is released. Often a picture may use a series of compression methods. When you open a file for decompression, you naturally want to use a similar master method and extract the files in reverse order.
Today, image files are getting larger and larger, and transferring files has become a “bottleneckâ€, especially for large-format color images, which can reach 450MB or even 1GB. In addition, although the FRACTAL compression method is a viable lossless compression, it still faces the problem of reading from magnetic media or optical media.
5. Incompatibilities between platforms In the past few years, the incompatibility between MAC, PC, UNIX, WORKSTRATION and personal systems has rarely been mentioned, but it does affect the efficiency of prepress work.
The ADOBE PDF workflow came into being under this background.
Second, PDF can solve the above problem PDF is a platform-independent file format that is suitable for various data compression methods. It can transfer files between different platforms, networks, and INTERNET without worrying about whether the contents of the files are distorted. Using the PDF file format, the previously mentioned issue of turning off fonts was solved, and the imported image files did not undergo any errors during the entire prepress process. In short, using PDF can achieve a true sense of what is seen. Income"!
Third, the PDF file's compressed PDF workflow converts continuous tone images, vector images, bitmap images, and fonts into POST script code, then uses DISTILLER to compress and edit the code to convert the file to PDF format, resulting in a PDF file before conversion. The file is much smaller.
An important feature of PDF is the ease and flexibility of file information compression. The same file can compress different types of data with different compression stages, making the file as small as possible, with little or no image quality. ACROBAT's compression menu provides four compression methods: JPEG, LZW, ZIP, and RUN LENGTH ENCODING.
JPEG: This compression method has five optional compression stages and is a lossy compression. The greater the degree of compression, the greater the loss of image quality. JPEG provides the largest compression ratio, so the file can be minimized. JPEG is suitable for data compression of continuous tone images.
LZW: This compression method is a LEMPEL-ZIV-WELCH (LZW) data compression algorithm, which is a lossless compression, suitable for single-color compression of the original, but also ideal for vector image compression. LZW is not suitable for continuous image adjustment because LZW generates larger files.
RUN LENGTH ENCODING: The most common example of this method for compressing monochrome accommodation is to compress a black and white text file. RUN LENGTH ENCODING is a lossless compression that produces smaller files.
The POSTscript image has three kinds of color bitmaps, grayscale bitmaps and monochrome bitmaps. Using ACROBAT, different compression methods can be used to compress different types of images. In ACROBAT, we can also set DOWN SANPLING RESOLUTION values ​​(according to the specific application), set automatic selection or artificially select compression methods. It must be noted that the different compression stages for different types of images are different. (To be continued)
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