There are many inspections that need to be done in the early stage of printing, as listed below:

One: screen check:

Picture check: Check the picture's color and picture quality on the calibrated screen. What is the level of the picture, how is the definition? It can be improved by color adjustment or sharpness enhancement. There are no miscellaneous lines, blemishes, or things that are not in harmony with the contents of the screen and can be patched with a rubber stamp. Is there an unobtrusive color block (this mark is likely to occur when an image is not properly repaired with a rubber stamp)? Can use fuzzy filter processing.

Color Block Check: Check the color matching in the layout file. Check the color of the color blocks, lines, and text in the typesetting file to see if they are harmonized. For example, if the white background is not easy to see, use a white word.

Two: print check:

Check the printable content. The print should be as close as possible to the future proofing, specifically:

1: Print according to the size set in the layout, do not reduce, which is the size of the future proofing, if your printer can not print large format files, block printing, block and block overlap, with transparency The glue connects them and the overlapping parts are precisely aligned. 2: It is better to draw corner lines, gauge lines, polylines, etc. before printing, because the printer can't automatically output the reference lines like photosetters. After printing, it should be cut and folded according to these reference lines to make a finished product model to check. This is particularly needed for complicated prints such as paper boxes, envelopes and the like.

Three: document inspection:

Image check: Check the file format. It can only be in tif or eps format before printing. Color mode, color picture is CMYK, monochrome picture is grayscale mode. RGB mode is not allowed. Resolution, to reach 300dpi. Remove redundant spot channel and alpha channels and remove extra paths. Check the black line, the color value of the black block of small area, under normal circumstances should be monochrome black: C0M0Y0K100.

Typographic file:

Check the size:

1: Does the page size meet the requirements of the finished product?

2: Printed parts often have the same size, such as: each page of the album, each side of the fold, the opposite side of the cube paper products, in the typesetting software, they should be the same size after bleeding, and their bleeding The situation may not be the same, so it is easy to cause errors. To do this, use the numeric functions of the typesetting software to accurately check, subtract the amount of bleeding from the width of each side, and calculate its size in the finished product.

3: In some prints, the same size may seem different. For example, the tongue of a carton should be narrower than the opening so that it can be inserted.

4: Some products are made up of several parts. Their printed materials are different. They are made in different documents, such as the envelopes and the contents of the album, the outer shells and the inner trays of the packaging, and these files are required for inspection. All open, compare the size of each part.

5: Spot color, whether the die-cut page is the same size as the four-color page, whether the spot color graphic and die cut line can be registered with the four-color graphic file.

Bleeding:

Check all the cuts and polylines and pay attention to the following questions:

1: The picture, the color block, the line is bleeding, the object on the cutting line must be bleeding.

2: After the picture bleeds, is there any important content on the page?

3: The contents of the bleeding should not be too close to the cutting line and be easily cut off (such as the page corner icon, page number).

colour:

1: The layout file can set the color mode for each fill color and outline color respectively, but only CMYK mode (for color mode) or grayscale mode (for monochrome mode) can be used before printing, and the most easily misused color The pattern is RGB, and its print results are unpredictable.

2: The black error is not noticeable, one of which is R0G0B0, which is usually generated when the black object is copied from other software, and the other is “registration color”, and its color value is C100M100Y100K100. , can only be used to draw reference lines outside the page for the printer to check the situation of four-color registration, and the results of these two black printing will be four-color overprint, easy to produce ghost due to inaccurate, in the thin line It is particularly noticeable that black lines, text, and graphics should generally use the monochrome black of C0M0Y0K100.

3: If the edges of the picture are required to merge with the color blocks underneath, they should have the same CMYK color value. If they only appear to be merged on the screen and the color values ​​are different, a stiff edge will appear when printing.

4: Check if misuse of the overprint color, light print color.

5: In many typesetting software, when changing a color on a color palette, using color blocks of this color, the lines and text will change color, so pay attention to this point.

6: Note that there are no subtle, invisible outlines of the graphics.

7: If the graphics should have contours, pay attention to the correct color of the outlines. Because many of the outlines are thin, misuse of printing, overprinting, and RGB colors are often overlooked.

link:

Each typesetting software has a "Link" dialog box, from which the basic picture can be checked.

1: Is there a picture lost? Or did you forget the link after the picture was renamed? This will make the picture not output in high resolution.

2: Did you misuse RGB and other pre-pressed color modes? Although the RGB picture is displayed normally in the typesetting software, the proofing out of the picture will make mistakes.

3: Whether there are extra channels or paths, this may make the picture output incomplete.

4: Did you misuse jpg and other pre-pressed formats?

Graphic style:

1: Pay attention to the abnormal changes in text passages, such as paragraph overflowing hearts, graphic misplacing.

2: Is there only one word at the end of the paragraph?

3: Whether some English alphabets use Chinese fonts, it is very awkward.

4: Is there any garbled or extra space?

5: Is there any violation of the content of the ban? Most punctuation marks cannot be at the beginning of the line (such as comma, period, burst, semicolon, colon, exclamation mark, right quotation mark, right parenthesis, right name), some punctuation Symbols cannot be at the end of the line (such as left quotes, left parentheses, or left-hand titles), and some characters cannot be disassembled (such as English numerals, dashes, and apostrophes) when they are on a branch.

6: Is there an incorrect half-width punctuation mark (eg English comma, full stop, semicolon, colon, exclamation mark, quotation marks, brackets).

7: Is there something that should be aligned and not aligned (such as the left and right alignment of the page of the body of the book, the alignment of the top and bottom of the page of the directory, the alignment of the contents of the table up, down, left, and right).

8: Whether there is a uniform style and not uniform content (such as the decoration of the book block pages, comments, and the style of the same title, the text and paragraph styles in the same article are inconsistent).

9: Is the text suppressed by the color of the picture? Or is the distance between the text and their appropriate?

10: Other issues that do not meet the rules of typesetting.

Four: film and proofing inspection:

(a): film inspection:

1: Check the number of films, four-color documents should have four films, if there is a spot color, each spot color more than one film, die-cutting, convex, hot stamping, etc. also need a separate film like spot color.

2: Identify the corresponding ink color for each film. This can be seen by proofing. At the edge of proofing, there are measurement and control strips, which are a series of color patches whose color values ​​are known and printed by various color films. If the first line of the control strip on the proof is C100, the second cell is M100, the third cell is Y100, the fourth cell is C100M100, the fifth cell is M100Y100, the sixth cell is C100Y100, and the seventh cell is C100M100Y100, For the eighth cell K100, it can be inferred that on the film corresponding to C (cyan ink), the first, fourth, sixth, and seventh grids of the monitoring bar are on the ground, and the second, third, fifth, and eighth grids are blank. On the film corresponding to the magenta ink, each two, four, five and seven of the measurement and control bar are in the field, and each, three, six, and eight cells are blank. On the film corresponding to Y (yellow ink), the measurement and control bar is third. The five, six, and seven grids are on the ground. The first, second, fourth, and eighth grids are blank. On the film corresponding to K (black ink), only the eighth grid is the field, and the rest are blank. Color, die cutting, convex, hot stamping and other films, it is easy to see from graphic content

3: Check the film registration situation, it is best to use a dedicated look sample stage, the surface is a frosted glass, there is a white light source underneath, or use a white ordinary table top, put a more complete picture of the film content (usually corresponds to The black ink film is placed on a countertop, and the other color films and spot colors are die-cut, the raised film is stacked one by one, and the corner lines of the four corners of the upper and lower films are all aligned to check whether their contents are aligned.

4: Check the film for scratches, dirty spots, ghost spots, laser lines, creases.

5: Check the number of screens and various screen angles. Experienced designers can see if these parameters are in compliance with requirements. They can also be checked with a 10x magnifying glass for printing.

6: Check the number of dots on the gray scale of the edge of the film. Each color block of the gray scale is defined as the number of dots. The actual number of dots in the 10x magnifying glass can be seen, and the deviation should not exceed 2 %.

7: If there are conditions, use a density meter to check if the density of the field can meet the printing requirements. It should be 3 or more.

(B) proofing inspection:

1: Check the content of the proof, just like checking the printed draft.

2: Check the size of the finished product. There is a corner line at each corner of the proofing. It is usually a double line. The inner line is a cut mark. The distance between the left cut mark and the right cut mark is measured. The width of the finished product, the distance between the upper cutting mark and the lower cutting mark, is the height of the finished product, depending on whether the finished product size reflected by the cutting marks meets your requirements.

3: Make a finished model, cut the proof along the cutting mark with a ruler and a utility knife, and then fold it into a finished product along the fold mark - especially for a three-dimensional print such as a carton After the inspection will not have any problems.

Check the film spot, proof appearance, finished model with proofing.