All about Page-Level Color Detection
Print job color detection refers to a process where a different print job cost is charged based on the use of color. Most organizations charge/account more for color jobs because of:
- Lease agreements - most leased devices have different “click costs” for color print jobs.
- Color jobs use more expensive toner.
- Color enabled devices can be more expensive to purchase than a black & white only printers.
PaperCut NG/MF allows administrators to set a different cost on color vs grayscale (Black & White) jobs and will apply these costs based on one of two different methods:
The color or grayscale charge is applied at the document level. It’s based on the user’s selection/use of the “grayscale” or “black and white only” option in the print preferences panel. If the user has selected grayscale, the job will be charged at the discounted rate for black and white, otherwise the document is assumed to be color. Standard Color Detection is also known as Document Level Color Detection.
Page-level color detection is a more advanced mode and it works by applying the different grayscale and color costs on a page by page basis. If the page contains any use of color, the color rate is applied for this page, otherwise the black and white rate is applied.
PaperCut NG/MF accomplishes page level color detection by carefully analyzing each individual pixel on the printed page. It looks for use of color in all areas of a page such as:
- Images (in all formats, bit depths and compression forms)
- Text (including text using embedded True Type fonts)
This analysis is done while the document is spooling to the print server before the print job is passed to the printer. This allows accurate costs to be calculated prior to print allowing appropriate actions to be taken as defined by the administrator.
Page-level color detection is usually also run in conjunction with Hardware Page Count Validation. The validation works by querying the printer’s hardware (via SNMP) after the job, to ensure the analysis done on the software layer on the server prior to printing is the same as observed by the hardware.
Currently, PaperCut NG/MF can perform page-level color detection with many popular Page Description Languages used by print drivers. Including:
This combination covers about 95% of business style network printers. Many manufacturers offer PostScript and PCL drivers as well as proprietary ones - check your printer manufacturer’s website for availability. Where possible we suggest sticking to PostScript as this is the most mature and open standard and is the only environment that offers support for all major platforms.
PaperCut NG/MF is not able to perform page-level color detection for proprietary page description languages like PCL3GUI. Print drivers like this may use non-documented and proprietary languages, which are often evolving and in many cases it’s not viable to support page-level analysis for these drivers. PaperCut supports page-level color detection on the EMF spool file format so page-level detection is possible on some GDI drivers that spool the jobs in EMF format - results may vary, so testing is always required. At a minimum, document-level color detection is supported in many GDI devices.
Page-level color detection does add overhead to job analysis. It’s extra work to search through a document looking at every pixel for color than it is just looking for page ends/starts. However, in the real world we find that the slowdown in analysis is minimal and not noted by end-users. The reason for this is that as soon as color is found on a page, the color analysis is turned off for the remainder of the page. In real-world documents, the increase in analysis time is around 10–20%. For example the analysis time of the PaperCut PDF manual (508 pages) in PCL6 is as follows:
|Standard Detection||315 ms|
|Page-Level Color Detection||364 ms|
|Difference||< 1ms per page|
Does PaperCut support color coverage or three-tiered billing (e.g. enhanced/limited or color coverage)?
This topic is addressed in detail in Tiered Billing and Color Coverage.
If your printer supports page-level color detection, we recommend enabling it as it provides the most fair and accurate policy for charging print usage. There are, however, a few reasons why sites often choose not to enable it:
- If some printers can’t support page-level color detection, it may make sense to leave it off for all printers to ensure that there is a standard and consistent charging policy across all devices in the organization.
- Page-level color detection can make it harder for a user to understand/predict a job cost.
If page-level color detection forms an important part of your print management strategy or print charging policy, please also take the time to read:
Keywords: colour detection, color detection, printer configuration, charging, color page quotas, mono, monochrome, difference between standard detection and page level detection
Image: cc-by-ca by Siri Hardeland