Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 766 / 987

COPIER (Service mode for copier) > OPTION (Specification setting mode) > IMG-MCON
PRN-FLG 2 Select of image area flag (PDL image)
Detail To set the image area flag for image processing which is performed when a PDL image fails to be
compressed at a specified compression rate.
If an image fails to be compressed at a specified compression rate, the following processing is
performed by default:
- Processing to prioritize text reproduction
- Replacement of the processed black with single Bk-color
Set 1 when moire occurs or jaggy is significant. Set 2 when not preferring to replace the processed
black with single Bk-color.
Use Case - When moire occurs or jaggy is significant in case of printing an image containing many halftone
dots or photos
- When avoiding to replace the processed black with single Bk-color
Adj/Set/Operate Method 1) Enter the setting value, and then press OK key.
2) Turn OFF/ON the main power switch.
Caution This setting trades off with reproducibility of text.
Display/Adj/Set Range 0 to 2
0: High screen ruling, gray compensation LUT
1: Error diffusion, gray compensation LUT
2: High screen ruling, normal LUT
Default Value 0
SCN-FLG 2 Select of image area flag (copy image)
Detail To set the image area flag for image processing which is performed when a scanned image fails
to be compressed at a specified compression rate.
If an image fails to be compressed at a specified compression rate, processing to prioritize
reproduction of text is performed by default.
Set 1 when an image contains many halftone photo images. Set 2 when an image contains many
printed photos.
Use Case
When copying an image which contains many halftone dots and photos
Adj/Set/Operate Method
1) Enter the setting value, and then press OK key.
2) Turn OFF/ON the main power switch.
Caution
This setting trades off with reproducibility of text.
Display/Adj/Set Range
0 to 2
0: Text, 1: Halftone photo image, 2: Printed photo
Default Value 0
TNR-DWN 2 Setting of toner deposit amount
Detail To set the toner deposit amount on the gradation area and text area.
By reducing the toner deposit amount when toner scatters or paper winds around the Fixing
Assembly in the case of full color, the symptom can be decreased, but the hue might change.
Use Case When a full color image is blurred due to toner scattering, etc.
When paper winds around the Fixing Assembly
Adj/Set/Operate Method 1) Enter the setting value, and then press OK key.
2) Turn OFF/ON the main power switch.
Caution Hue might change depending on the setting.
Display/Adj/Set Range 0 to 5
0: Gradation area 200 %, Text area 180 % (Normal)
1: 180 %, 165 %
2: 140 %, 130 %
3: 160 %, 150 % (Normal 1, Recycle 1 paper, Thin paper)
4: 160 %, 150 %
5: 160 %, 150 % (Transparency only)
Default Value 0
Additional Functions
Mode
Adjustment/Maintenance> Adjust Image Quality> Adjust Toner Amount at Color Printing
8. Service Mode
755