Description
Calculate a print-spine width after adding a supplied width adjustment.
Print and screen geometry depends on coordinate scale, placed image size, bleed/inset definitions and pixel transparency. Placed pixels per inch differs from printer dots per inch, and a caller-chosen margin differs from a verified production tolerance. Empty-image conventions and threshold equality affect bounding results.
Calculate a print-spine width after adding a supplied width adjustment.
When to use this tool
Use Print Spine Width Offset when checking the stated artwork geometry, placement, screen angle or alpha-bound convention.
How to use the tool and how it works
- Enter baseSpineWidth, suppliedAdjustment. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read adjustedSpineWidth. Use the output convention below.
Require baseSpineWidth>=0 and base+suppliedAdjustment>=0. Return their sum.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| baseSpineWidth | Base Spine Width | Required. Finite number; minimum 0. |
| suppliedAdjustment | Supplied Adjustment | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| adjustedSpineWidth | Adjusted Spine Width | Required. Finite number. |
{
"input": {
"baseSpineWidth": 12,
"suppliedAdjustment": 0.5
},
"output": {
"adjustedSpineWidth": 12.5
}
}Limitations and assumptions
- Adjustment is a signed supplied length; paper caliper, binding method and printer requirements are not inferred.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Inspect rendered artwork and verified production/device specifications for actual print quality, cropping, fit and manufacturing requirements.
References
Similar or alternative tools
- Print Bleed Crop Box Delta
Calculate bleed-box dimensions from trim dimensions and four supplied bleed insets.
- Baseline Grid Line Offset
Locate a baseline-grid line from its origin, spacing and line index.