How To Label A Photo In Chicago Style: The Complete CMOS Image Caption And Citation Guide

To label a photo in Chicago style, place a label such as "Figure 1" directly below the image, followed by a period, a space, a descriptive caption, and a formal source citation. For academic papers and publications, the citation must specify the creator's name, the title of the work, the date of creation, the medium, and the hosting institution or URL. Adhering to these strict Chicago Manual of Style (CMOS) standards ensures intellectual property compliance, maintains editorial consistency, and preserves historical metadata.

Pre-Formatting Requirements and Metadata Checklist

Before embedding and labeling any photograph or illustration in an academic paper, book manuscript, or digital archive, you must gather precise historical and technical metadata. Whether you are formatting a digital scan for a university thesis or processing physical prints for local archives like the Chicago History Museum, preparation prevents formatting errors that can lead to plagiarism accusations or metadata degradation.

Review this foundational checklist to ensure you have all the necessary tools, information, and specifications before starting the labeling process:

• Essential Tools and Software: A standard word processor (such as Microsoft Word, Google Docs, or Apple Pages), a citation manager (Zotero or EndNote), access to the Chicago Manual of Style (17th or 18th Edition), and a soft-lead archivist pencil (specifically 6B or a Stabilo All-Black pencil) for physical labeling.
• Mandatory Image Metadata: Full name of the photographer, illustrator, or artist; formal title of the photograph (or a detailed descriptive title if untitled); exact year or estimated date of creation; original medium (e.g., gelatin silver print, digital JPEG, oil on canvas); and the physical or digital repository holding the image (along with any unique accession or item numbers).
• Archival Material Standards (For Physical Photos): Acid-free, lignin-free archival paper labels, polyester (Mylar) sleeves, and archival-safe, pressure-sensitive adhesive if you are processing physical collections within Illinois archival systems.
• Technical Benchmarks: Digital images intended for print publication must be saved at a minimum resolution of 300 DPI (dots per inch) in TIFF or high-quality JPEG format. Digital-only displays require a minimum of 72 to 150 DPI.
• Estimated Process Duration: Approximately 5 to 10 minutes per digital photo label for standard academic manuscripts; 15 to 20 minutes per photo for physical archival indexing, cataloging, and labeling.

Step-by-Step Guide to Labeling and Citing Photos in Chicago Style

Labeling a photo using the Chicago Manual of Style involves two distinct actions: assigning a figure number with an explanatory caption directly beneath the photo, and providing a corresponding entry in your bibliography or reference list. If you are handling physical photos in a local historical context, you must also apply physical labeling standards to avoid damaging the medium. Follow these step-by-step instructions to execute both digital formatting and physical processing.

Step 1: Position the Photograph and Assign the Figure Label

Place the photograph directly after the paragraph where it is first mentioned or referenced in your text. Do not group all images at the end of the document unless specifically requested by an acquisitions editor or dissertation committee.

1. Center or flush-left align the photograph on the page, keeping a consistent margin of 1 inch on all sides.
2. Directly below the bottom edge of the photo, type the label "Figure" followed by the Arabic numeral that corresponds to its appearance in the text (e.g., "Figure 1", "Figure 2"). Do not use Roman numerals.
3. Place a period immediately after the number, followed by a single character space.
4. If your publication requires abbreviated labels, use the abbreviation "Fig." followed by the number and a period.

Warning: Never embed a photo in your text without referencing it beforehand in your narrative. Use a parenthetical citation such as "(see figure 1)" or integrate it directly into the sentence: "As illustrated in figure 1, the architecture of the Loop...".

Step 2: Write the Descriptive Caption

The caption serves to explain what the reader is looking at. Under CMOS rules, a caption can be a short phrase, a complete sentence, or a multi-sentence description.

1. Begin the caption with a capitalized letter, following standard sentence capitalization rules.
2. Keep the descriptive text concise. Focus on the who, what, where, and when of the photograph.
3. Use a period at the end of the caption, even if it is a sentence fragment or a short phrase.
4. Maintain a font size that is slightly smaller than your body text (typically 10-point font if your body text is 12-point) to visually distinguish the label and caption from the main narrative.

Step 3: Integrate the Source Citation into the Caption

To avoid cluttering the page, Chicago style allows you to provide source information directly within the caption itself, following the descriptive text. This is highly recommended for publications that do not feature a formal bibliography.

1. Introduce the source details with a word or phrase such as "Source:", "Courtesy of:", or "Photo by".
2. For an online or published photo, include the photographer’s name, the title of the photo (italicized), the date, the publishing outlet or museum repository, and the URL or DOI if applicable.
3. If the photo is licensed under Creative Commons, append the specific license type (e.g., CC BY-SA 4.0) to the very end of the citation.

Pro-Tip: If your paper uses the Notes-Bibliography system and includes a full citation in the bibliography, you can use a shortened citation format in the figure caption to keep the layout clean and professional. For example: "Figure 3. The Chicago skyline at dusk, 1974. Photo by Richard Nickel. Courtesy of the Chicago History Museum."

Step 4: Construct the Bibliography or Reference List Entry

If your document includes a bibliography, every labeled photograph must have a corresponding, highly detailed citation entry. The structure of this entry changes depending on whether the photo was retrieved from an online archive, a physical museum collection, or a published book.

1. For Archival Photos (Physical/Digital Archives): Start with the creator's last name, first name. Next, provide the italicized title of the photograph or a detailed description in normal type if it is untitled. State the date of creation. Name the collection, the accession box and folder numbers, and the name of the repository (e.g., Harold Washington Library Center, Chicago Public Library).
2. For Published Photos (Books/Journals): Start with the photographer’s last name, first name. Provide the italicized title of the photograph and the date. Then, list the publication details of the book or journal where you found the photo, including the page number, plate number, or figure number.
3. For Web-Based Photos: Start with the photographer’s last name, first name. Provide the italicized title of the photograph and the date. State the name of the website or digital library, the date you accessed the image, and the exact URL.

Step 5: Process Physical Photos for Local Chicago Archives

If you are preparing physical photographic prints for local historical societies, public libraries, or private collections within the Chicago municipal system, you must follow archival labeling standards to preserve the integrity of the physical paper.

1. Place the physical photograph face down on a clean, dry, hard surface covered with a sheet of acid-free glassine paper.
2. Using an extremely soft 6B graphite pencil, write the identifying accession number, photographer name, and date lightly along the reverse outer edge of the print.
3. Apply absolutely minimal pressure to prevent the graphite from embossing or breaking through the front emulsion layer of the photograph.
4. If writing directly on the back is not feasible due to a plastic-coated RC (resin-coated) backing, print the metadata onto an acid-free, pressure-sensitive label using archival pigment ink. Let the ink dry completely for 24 hours, then apply the label to the back center of the print.

Chicago Style Image Labeling and Citation Specifications

The table below outlines the precise formatting specifications, structural templates, and real-world examples for the various methods of labeling and citing photos under the Chicago Manual of Style rules.

Common Citation Errors and Corrective Action Plans

Even experienced scholars and database administrators run into trouble when labeling and citing photos. Below are four common failure scenarios encountered during the Chicago labeling process, along with their root causes and actionable field fixes.

Failure Scenario 1: Ghost Citations and Missing Photographer Information

• Root Cause: The researcher downloaded a historical photo from an online search engine or social media platform without checking the primary hosting metadata, leaving them with an image but no photographer name or original creation date.
• Actionable Fix: Conduct a reverse-image search using Google Images or TinEye to trace the photo back to its original institutional repository (such as the Library of Congress or the Chicago Public Library Digital Collections). If the creator's identity remains completely unknown after a thorough search, begin your bibliography entry with the title of the photo. If the photo has no title, create a brief, brackets-free descriptive title (e.g., "Pedestrians walking down State Street, Chicago, circa 1930") and use that description in place of the author's name.

Failure Scenario 2: Double Labeling with Tables and Figures

• Root Cause: The author labeled a photograph or chart as "Table 1" because it contains visual data, or they labeled it as "Image 1" instead of adhering to the standardized CMOS term "Figure".
• Actionable Fix: In Chicago style, all non-tabular visual materials—including photographs, maps, charts, graphs, and drawings—are classified exclusively as "figures". Only structured grids of alphanumeric data are labeled as "tables". Change any "Image", "Photo", or "Map" labels to "Figure" (or "Fig.") and re-sequence your figure numbers sequentially throughout your document.

Failure Scenario 3: Physical Ink Bleeding and Chemical Emulsion Damage

• Root Cause: An archivist or collector labeled a physical photographic print by writing on the reverse side with a standard blue or black ballpoint pen, or a permanent felt-tip marker. The acid in the ink corroded the paper fibers, bleeding through to the front of the photo and permanently staining the emulsion.
• Actionable Fix: Immediately cease using all ink pens, felt-tip markers, or gel pens on historical photos. To salvage a bleeding print, digitize it immediately using a flatbed scanner at 600 DPI to preserve the front image. Place the physical print into a custom-sized Mylar sleeve, and apply all future metadata labels to the outside of the protective sleeve using a permanent marker, completely avoiding direct contact with the print.

Failure Scenario 4: URL Rot and Broken Links in Web Citations

• Root Cause: A web-based photograph citation points to a specific URL that has gone offline, rendering the citation unverifiable for peer reviewers and readers.
• Actionable Fix: Check your web references prior to publication. If a hosting site has altered its link structure or gone offline, search the Wayback Machine (Internet Archive) for the original URL to locate a cached version. If a cached version exists, update your bibliography entry to include the original URL, followed by the archival URL provided by the Internet Archive. For stable academic citations, always prioritize using a Digital Object Identifier (DOI) or a persistent handle link over standard web URLs whenever they are available.

Frequently Asked Questions

Do I need to list every labeled photo in a Bibliography in Chicago style?

If you have included a complete, detailed citation in the figure caption directly beneath the photograph, you do not always need to include a duplicate entry in your bibliography. However, this depends on your target publication's specific guidelines; many book publishers, academic journals, and university departments require all cited visual materials to appear in both the caption and the final bibliography.

How do I label a photo that I took myself in Chicago style?

To label your own photograph, use the standard figure format below the image and write "Photograph by author" or "Photo by author" followed by the date the image was taken. You do not need to create a bibliography entry for personal photographs, as the caption itself provides all the necessary context for the reader.

What is the difference between a figure label and a caption?

The figure label is the technical identifier (such as "Figure 1.") that connects the image to references within your main text. The caption is the descriptive explanation that follows the label, detailing the subject matter of the photo, its historical context, and the source citation information.

How do you cite a photo retrieved from social media like Instagram or Flickr?

Citing a photo from social media under Chicago guidelines requires you to list the photographer's real name (if known) and their profile handle in parentheses. State the title or a brief description of the photo in quotation marks, the platform name, the date it was posted, and the direct URL. For example: "Figure 4. Jane Doe (@chi_urban_photo), 'Wacker Drive at Night,' Instagram, September 12, 2023, www.instagram.com/p/example."

Should the figure label "Figure 1" be italicized or bolded?

According to the Chicago Manual of Style, figure labels below images should be set in normal, roman-type font. They should not be bolded, italicized, or underlined. The descriptive caption that follows the label should also be formatted in standard roman type.

Elevate Your Academic and Archival Publishing Standards

Consistently applying correct formatting to your research publications and historical collections ensures your work meets the highest standards of academic excellence and professional integrity. If you are preparing a manuscript or processing regional collections, aligning your digital workflows with the guidelines outlined above will ensure your visual media remains clear, organized, and fully verifiable.