When printed matter is mass produced and delivered to customers. What we have to do is to test the quality of printed matter through proofing. To ensure that this is the printed matter the customer wants. For the quality inspection of printed matter, we mainly inspect the following aspects:
Is the proof too dark, too bright or lacks contrast? Are neutral areas like white, gray, and black printed with colors that we don’t want? For example, you should carefully check gray areas such as cement roads or asphalt roads to ensure that they are not printed in red, blue, or green.
Are the details in the highlights and shadows of the image clearly identifiable? If the original image or manuscript itself lacks details, then we don't have to consider this issue in the copying process, but if the manuscript brought by the customer has details, then we should keep them.
Especially when photographing or scanning originals with patterns (textile fibers or geometric patterns, etc.), we need to perform special processing on the image. Sometimes we can use the "slight blur" option in Photoshop to avoid the appearance of moiré. You may also want to determine which situation you can't tolerate the most-is it the hateful moiré or the loss of image detail after blurring.
This is a great opportunity to check the edges of the image, whether you created them yourself or let the catalog printing service provider create them for you. Some outlines that are acceptable on the screen will not be the case when they are on the actual proofs, and you may have to clean them up.
If you have asked the catalog printing service provider to retouch the product, can the samples you get show this effect? Do you need additional processing on the proofs to achieve the effect you want? Are there any problems that have not been shown before and need to be resolved on this sample?
Printed matter check image sample
Image proofs are sometimes called random proofs or broadcast proofs, because these proofs only have images and no information about the page layout. If you don’t know how the scanned images or digital photos will be copied, or if the catalog printing service provider has done the scanning for you, you may want to check the images before entering the next production step Proofs.
When you plan to put an image in the page layout, can it occupy the entire target area? Don't cut the content that shouldn't be cut. In addition, if you only need to use a small part of an image, you can cut off all the useless images to save storage space and speed up processing.
Determine in the final layout, whether the image you are dealing with will be used in landscape or portrait orientation.
Printed matter matches original
Can this sample really reproduce transparent originals, reflective artwork or digital photos? The degree of matching between the proof and the original is sometimes a subjective evaluation, but we can check whether the proof matches the original under the premise of using only CMYK four-color pigments.
High-quality printed matter must meet the various testing conditions mentioned above, so that such printed matter can be mass-produced and delivered to customers.