Graphics

• Why Doesn't My knitr Example Produce Graphics?
  Troubleshoot missing knitr graphics by checking chunk options, plotting commands, explicit printing, and whether you rendered the output document.
• Which LaTeX Package Generates QR Codes?
  Use the LaTeX qrcode package and its \qrcode command to encode text or a URL directly in a document, with adjustable size and error correction.
• Why Does a Black-and-White JPG Appear Black in a PDFLaTeX Document?
  A black JPG in a PDFLaTeX document often points to a CMYK or YCCK color-space issue. Check the file and convert it to PNG or sRGB.
• Why an Image Does Not Show with natwidth and natheight
  In a DVI-to-PostScript workflow, natwidth and natheight set assumed dimensions; they do not make PNG or JPEG files render. Use EPS or compile to PDF.
• How to Align an Inkscape PDF+LaTeX Overlay in LaTeX
  Use Inkscape’s generated .pdf_tex as the main figure when possible; for a separate overlay, match page bounds and width, then align both boxes.
• TikZ or EPS: Which Should You Use for LaTeX Figures?
  Compare TikZ and EPS for LaTeX figures, including editability, compiler compatibility, output quality, and when to choose each format.
• How to Refer Readers to the Online Version in a Figure Caption
  Use the journal’s required wording; otherwise, add a brief note saying the color version of the figure is available online.
• How to Place Two Images Side by Side in LaTeX
  Place two images side by side in LaTeX with subcaption, set their widths to fit the line, and add individual or shared captions and labels.