Color Space for Human Eyes, CMYK and RGB

When the artwork is done, it needs be converted to the CMYK mode if it works in the RGB mode. Actually, the RGB color has the bigger color space than the CMYK. A perfect RGB mode artwork might lead to the very dull printing effect, because the CMYK has limited color space. Some colors in the RGB range can not be reproduced by the CMYK printing.

Below is the diagram to show the color space for human eyes, CMYK and RGB.


Preview Seperations in Illustrator

CMYK Color Mode is what we use in the printing.

First, we need make sure that the artwork we open in the Adobe Illustrator is working under the CMYK mode. Click File — Document Color Mode — CMYK Color Mode

Second, click Window — Seperations Preview to open the Seperation Preview window.Then check the Overprint Preview checkbox. Here we will know the color number to be printed.

Third, click on the eyeball icon in front of each channel name in the Separations Preview panel to turn off visibility for all separations, then turn on visibility one CMYK channel or spot color at a time. If the artwork has no change when you click on a chanel, it means that color exists. Not otherwise.


Paper Grammage(GSM), PT and Thickness Comparison and Conversion Table

Paperboard Thickness and Grammage Conversion Table

单铜,双铜,白卡,灰底白板纸张克重gsm, 厚度和pt对照转换表格

In China, the thickness of the paperboard is measured in milimeters, while point is used in USA, which is abbreviated to pt. The fomulas below can be used for the conversion of the 2 units.

1 inch =25.4mm = 1000 pt. 

1 pt = 0.0254mm

For example, 60pt=60*0.0254mm=1.524mm. The 60pt chipboard in USA refers to the 1.5mm greyboard in China, which is very ideal for the small rigid paper boxes. When you need a strong rigid box, 80pt chipboard can be used, which is 2mm thick greyboard in China.

– 标准厚度(mm)         – 标准厚度(mm)  
10PT 0.254                    11PT 0.279  
12PT 0.305                    13PT 0.330  
14 PT 0.356                   15PT 0.381  
16 PT 0.406                   17PT 0.432  
18 PT 0.456                   20 PT 0.508  

Below is the paper details used at DE Printed Box.

白卡纸,单铜(SBS C1S) 双铜纸(SBS C2S) 哑粉纸,铜版纸(Art Paper) 双胶纸(Woodfree Paper)
GSM mm GSM mm GSM mm GSM mm
210 0.27 80 0.06 105 0.09-0.1 80 0.095
230 0.3-0.31 105 0.08 128 0.12-0.13 100 0.11
250 0.33 128 0.1 157 0.16 120 0.14
300 0.4-0.41 157 0.12 200 0.19-0.2 150 0.17
350 0.47-0.48 200 0.17 250 0.25 180 0.2
400 0.55 210 0.21 300 0.31 200 0.23
230 0.25 250 0.29
250 0.265 300 0.33
300 0.35 350 0.4
350 0.41 400 0.47
400 0.465
SBS C1S(白卡)PT/GSM Comparison Table SBS C2S(双铜)PT/GSM Comparison Table
PT 标准克重GSM 使用克重 PT 标准克重GSM 使用克重
7PT 161g 7PT 182g
8PT 174g 190g 8PT 195g
10PT 199g 210g 9PT 225g 230g
11PT 225g 230g 10PT 234g 230g
12PT 236g 250g 12PT 272g 300g
14PT 265g 300g 14PT 306g 300g
15PT 280g 300g 16PT 340g 350g
16PT 296g 300g 18PT 358g 350g
18PT 324g 350g 20PT 420g 400g
20PT 345g 350g 24PT 230G白卡对裱
22PT 379g 400g 30PT 300G白卡对裱
24PT 407g 400g
26PT 435g 450g
灰底白板(Duplex Board with Grey Back) 白底白板(Duplex Board with White Back)
GSM mm GSM mm
250 0.32 300 0.37-0.38
300 0.37 350 0.44-0.45
350 0.44-0.45 400 0.5-0.51
400 0.49 450 0.57-0.58

Note: 1. The duplex board with grey back is also referred to as the while lined chipboard with greyback, clay coated new back(CCNB).

2. The duplex board with white back is also referred to as the white lined chipboard with white back.

3. The wouldfree paper is also referred to as the offset paper

4. The SBS C1S, C2S is also referred to ivory board or art paper in China. C1S means that the paper is coated on only one side of the paperboard. C2S means that both sides of the paperboard are coated. Ivory paperboard in China usually refers to the SBS C1S. Such papers are used to make the luxury printed paper boxes and cosmetic boxes.

5. The art paper is also called coated paper.