Description
Calculate retention=dryLength/wetLength and requiredWetLength=desiredDryLength*wetLength/dryLength.
Studio measurements translate a design into lengths, areas, volumes, angles, proportions, and material quantities. Consistent units and an explicit geometric model make the calculation interpretable. Real materials, fabrication allowances, visual judgments, and installation conditions require information beyond a geometric term.
Calculate retention=dryLength/wetLength and requiredWetLength=desiredDryLength*wetLength/dryLength.
When to use this tool
Use Watercolor Paper Stretch Shrink Ratio when you need a geometric or material-budget term for a supplied studio design before checking real material and installation conditions.
How to use the tool and how it works
- Enter wetLength, dryLength, desiredDryLength. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read retention, requiredWetLength. Use the output convention below.
Calculate retention=dryLength/wetLength and requiredWetLength=desiredDryLength*wetLength/dryLength. Require positive measured wet and dry lengths and nonnegative desiredDryLength.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| wetLength | Wet Length | Required. Finite number; strictly above 0. |
| dryLength | Dry Length | Required. Finite number; strictly above 0. |
| desiredDryLength | Desired Dry Length | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| retention | Retention | Required. Finite number. |
| requiredWetLength | Required Wet Length | Required. Finite number. |
{
"input": {
"wetLength": 110,
"dryLength": 100,
"desiredDryLength": 50
},
"output": {
"retention": 0.9090909090909091,
"requiredWetLength": 55
}
}Limitations and assumptions
- The ratio assumes the supplied measured shrinkage applies to the desired size. Retention is not restricted to one, and paper type, direction, humidity, and stretching procedure are not modeled.
- The field tables state structural bounds; the mechanics also specify cross-field constraints. Malformed inputs and unsupported domains cause errors. A successful false flag, empty branch value, or zero placeholder has the meaning stated above and is distinct from an input error.
- 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. Signed zero is exported as zero.
Alternative or Complementary methods
Use measured material allowances and a complete drawing or fabrication model when physical behavior matters. The supplied geometric term can be one input to that separate process.
References
Similar or alternative tools
- Artwork Panel Spacer Ratio
Return ratio=spacer/panelWidth, requiring nonnegative spacer and positive panelWidth.
- Art Print Edition Spoilage Remainder
Calculate requiredGood=numbered+proofs, usable=printed-spoilage, and surplus=usable-requiredGood.