Recover a clipped SVG effect by tracing its output region

Identify what is being clipped

Filter Effects Level 1 is a Working Draft (18 December 2018). Shift input [40,100] by 20 to [60,120]. Region [0,100] retains [60,100]; region [0,120] retains everything. Primitive bounds stay ample and fixed.

Choose a simple, opaque diagnostic shape rather than a complex photograph or a soft shadow whose edge is difficult to define. Record the intended effect independently of the application’s current output. The purpose is to locate a hard boundary with a known expectation, not to make a subtle cosmetic judgment by comparing unrelated screenshots.

Keep the source shape unchanged in every candidate. Give the drawing, effect output and retained area separate labels in the worksheet. If all three are called the image, a request to make it wider can change the wrong object. Ask the implementation owner to identify which values describe each region and which coordinate reference they use.

Draw the expected intersection before asking for a repair

Place the input interval, translated interval and permitted interval on one numbered axis. Shade their overlap and mark the rejected strip separately. The accompanying Python arithmetic records this invented case; no browser filter was executed. The diagram lets the reviewer explain where the missing portion belongs before proposing a larger canvas or a smaller source.

Use explicit user-space coordinates in the proposed fixture and keep the enclosing component generous enough that it cannot explain the selected boundary. Record the primitive’s own limits as a separate controlled condition. The reviewer must not attribute a result to the outer filter region while another active limit could produce the same cut. Where the owner cannot isolate those conditions, keep the diagnosis provisional.

Ask whether the missing strip is part of the approved effect or deliberately excluded. The arithmetic establishes the candidate’s coverage, not the creative intention. A purposeful hard crop may be acceptable; an accidental truncation of a badge’s identifying shadow may not be. Document that distinction before widening anything in a real asset.

Test one bounded candidate rather than unlimited padding

Have the authorized owner supply a controlled receiving demonstration that changes only the proposed boundary. Compare the same source and effect under the same component conditions. Keep the baseline beside the candidate so an apparent improvement cannot be attributed to an unreported change in shape, offset or layout.

If the predicted missing strip returns, inspect the rest of the effect and its neighboring content. The correction should not expose unwanted material or alter a deliberately contained presentation. Avoid setting enormous dimensions merely to make clipping disappear. An unexplained overlarge region weakens the diagnosis and may impose unnecessary work on the receiving implementation.

If the candidate does not behave as predicted, inspect the controlled conditions before widening it again. A primitive subregion, an enclosing container or an unsupported implementation could require a different explanation. Preserve those alternatives as questions for the responsible owner rather than stacking compensations until one screenshot looks acceptable. The original artwork remains evidence, not a convenient place to hide the defect.

Close the decision at the correct boundary

Retain the numbered-axis calculation, candidate dimensions and actual receiving observation when available. State which stage was computed and which was executed. The cited Working Draft is a technical reference with explicit status, not certification that a particular browser or export pipeline implements every feature. No renderer test has been claimed for this lesson’s arithmetic.

Revisit the bounded calculation when the source dimensions or effect displacement changes. A previously adequate output area may no longer cover the approved result, but that does not justify altering unrelated layout limits. The handoff should name the exact object the owner must reconsider and the consequence of doing so, allowing a future producer to repair the effect without changing correct source geometry.

Make the reasoning concrete.

A fictional event badge has an offset accent that stops abruptly. The designer proposes making the badge narrower so the accent appears to fit inside the current output.

The team retains the approved badge and requests a bounded output comparison. It does not authorize unlimited padding or a production setting change.

Take the questions into your next brief.

Use these prompts in your own notes. Nothing is submitted from this page.

1. Input

   Which untouched shape supplies the diagnostic evidence?

2. Result

   Where should the intended effect extend?

3. Region

   Which limit retains or excludes that result?

4. Isolation

   What other bounds are held fixed?

5. Decision

   Is the excluded strip intentional, and who may change its treatment?

Watch for the wrong conclusion.

• Reshaping correct artwork to hide a boundary defect.
• Changing several clipping conditions simultaneously.
• Calling a larger region proof of a correct diagnosis.

Sources & scope

Workflows and fictional business examples are original editorial analysis. Source mechanics and their repeated applications are charged. Python mathematical assertions were executed; no browser or 3D renderer test, real asset edit, configuration change or publication is claimed.

• Filter Effects Module Level 1 →Primary specification, Working Draft, 18 December 2018 · Supports: Supports filter bounds and offset.