1. What is 600e DPI?

2. 600 Dots Per Inch
Does RISO’s RZ Series 600e dpi resolution actually meet a 600 x 600 dpi specification?
The simple answer is YES! But we should be clear that 600e dpi actually emulates true 600 x 600 dpi.
600 dots
600 dots
If a 1” square area were completely filled with dots, there would be 600 dots across and 600 dots down.

3. What’s the Difference? True 600 dpi 600e dpi
Each dot is individually controlled (both across and down) and perforated in the master where required to complete an image.
600e dpi
Dots are individually perforated down the image (true 600 dpi)
Dots are perforated in pairs across the image, emulating true 600 dpi.
An algorithm is used to determine whether to burn a pair of dots in a specific location to replicate the scanned image. While they are controlled in pairs across the image, the size of the dots is exactly the same in both directions which results in better output.

4. What’s the Difference?
The more dots there are in a defined area, the smaller the dots will be resulting in higher resolution and smoother edges.
Dots Per Inch (dpi)
300 x 300
300 x 400
400 x 400
600e x 600
600 x 600
Dots in 1" square
90,000
120,000
160,000
360,000
Perforations, Dot Control
180,000
Output Quality
Good
Excellent

5. Examples of various dpi:
300 x 600 dpi
Larger, elongated dots and less of them make the edge of the character appear more jagged.
True
600 x 600 dpi
300 x 300 dpi
Larger dots and less of them make the edge of the character appear more jagged.
Emulated
600e x 600 dpi

6. True 600 dpi vs. Emulated 600 dpi
True 600 x 600 dpi
600e dpi
What happens?
600e positions the dots in pairs. An algorithm is used to decide where the pairs should be placed. The pink dots have been dropped and the light blue dots have been added to complete a pair.

7. Dot Size
The area in the squares is the same. The number and size of the dots that fill the area vary.
600 x 600 dpi
4 perforations
4 dots
600e x 600 dpi
2 perforations
4 dots
300 x 300 dpi
1 perforation
1 dot
300 x 600 dpi
2 perforations
2 dots

8. Resolution –Magnified View of Perforations in the Master Material
The area in the squares is the same. The number and size of the dots that fill the area vary.
600dpi
400dpi
600e-dpi
300dpi

9. Magnified Comparison of the Perforation Sizes
600 × 600 dpi
600e dpi × 600 dpi
300 × 300 dpi

10. Q & A Are the RZ310, RZ390, and RZ590 600dpi machines?
Yes.  They create 600 holes in each direction in a 1 inch area but, in one direction (across) the holes are perforated in pairs emulating true 600 dpi.
Are the RZ310, RZ390, and RZ590 true 600dpi machines?
They are 600dpi machines, but control dots in pairs across the image, rather than single dots which is why we refer to it as 600e-dpi.  In other words, depending on the image, you might see some differences.
What difference will you experience by comparing a 600e-dpi to a true 600dpi image?
You will see little difference when you compare standard text documents.  However, you will see some difference when comparing fine lines and pictures.  Overall, the image quality of 600e-dpi is better than true 300dpi, but less than true 600dpi image.
How much is the image improved from a RN machine?
RN resolution is 400dpi x 300dpi, creating 120,000 dots in 1 square inch area.  The RZ310 and above has 600e-dpi x 600dpi resolution, capable of creating 360,000 in 1 square inch area, and controlling 180,000 pairs of dots. The more dots there are in a defined area the better the quality of the output.

11. Four of us are better than one of you!
Thank you!
Four of us are better than one of you!
Remember:
The more dots per inch, the higher the resolution. The higher the resolution the better the image!