Check line thickness in the final-sized artwork and exported pages, not only in the original drawing. KDP’s paperback guidance specifies a minimum line weight for charts, tables, and graphic elements. Verify that requirement and inspect contrast, intersections, and labels so the printed figure remains understandable.
Inventory the lines that carry information
Identify lines whose visibility matters to the reader. These include table rules, diagram connectors, dimension marks, graph axes, and label leaders. Decorative lines also need production review, but a missing connector can change the meaning of a figure in a way that a lost ornament may not.
Inspect the complete illustration rather than only its main outline. Small arrows and internal boundaries are easy to overlook when a large shape remains visible. Record figures with especially dense or delicate line work so they receive attention in the final layout review.
Check the requirement for the intended format
Review the current KDP paperback submission guidance for line weight before preparing the file. The guidance specifies a minimum thickness of 0.75 point for lines in charts, tables, and graphic elements. Keep the source and verification date with the production criteria instead of relying on a remembered design preset.
Treat that minimum as a production requirement rather than a complete readability standard. A line can meet a thickness threshold and still be hard to distinguish against its background or among many similar lines. The figure also needs enough contrast and spacing to communicate its intended relationships.
Measure after the artwork is scaled
Check the size at which the figure is placed in the book. Reducing a drawing can reduce the apparent thickness of its strokes, so a suitable source file may become unsuitable when squeezed into a smaller slot. Verify the final treatment rather than approving the original dimensions alone.
If the production tool scales strokes differently from the rest of the artwork, inspect the actual exported result. Do not assume that a setting name describes what happened in the file. Compare a representative line and its surrounding detail before applying the same transformation to every figure.
Review contrast and crowded intersections
Inspect pale lines, lines over shaded areas, and places where several connectors meet. A technically present stroke may merge with another element or disappear visually against a similar tone. Adjust the composition or contrast so the reader can follow the intended path without guessing.
For diagrams with several line types, verify that the distinctions survive the selected interior treatment. If solid, dashed, and dotted lines represent different meanings, explain them in a readable key and check them at actual size. Color alone may not be enough to preserve the distinction in every intended edition.
Keep labels and arrows connected to their targets
Follow each leader line from its label to the intended feature. Thickening a line can improve visibility while making a dense intersection harder to interpret. Review the whole annotation system after changing stroke weight rather than assuming the adjustment is purely cosmetic.
Check arrowheads and endpoints as well. They may be separate objects or have a different visual weight from the line they belong to. If a connector appears to stop short or point at two possible targets, revise the layout so the relationship remains unambiguous.
Verify the exported pages and a physical sample
Inspect the final PDF at the intended reading size and check that export settings have not altered the line treatment. Review any figure that was resized late in layout. A previously approved asset needs another check when its placement changes the conditions under which it will be read.
Use a physical sample to assess the complete reading experience, especially for dense diagrams and fine table structures. Preserve the editable artwork and approved line settings with the edition files. Later revisions can then begin from known production choices instead of rebuilding delicate details from a flattened image.
Frequently asked questions
Clear answers for this publishing decision.
Is the source drawing’s stroke width enough to approve the figure?
No. Check the artwork at its final placed size and inspect the exported result. Scaling and production settings can change the line treatment readers receive.
Does meeting the minimum line weight prove a diagram is readable?
No. Also review contrast, spacing, intersections, labels, and the meaning assigned to different line styles. The minimum addresses one production property.
Should every line be made equally thick?
Use a clear hierarchy that preserves the intended meaning while meeting applicable requirements. Emphasizing every line equally can make a complex figure harder to read.
What must I check, disclose, and verify myself when AI helped produce the book?
Review facts, rights, and source material yourself, record which parts were AI-assisted or AI-generated so you can answer Amazon’s disclosure question accurately, and treat every automated check as a starting point rather than a verdict.
See what the compliance checks cover