What "Medium" Means in Photography and Why It Matters

Medium in photography refers to the material or process you used to capture and produce the final image — not the subject matter or style. When you label a photograph's medium, you are telling viewers and archivists exactly what they are looking at: a digital print, a silver gelatin print, a slide, a daguerreotype, or something else entirely. This matters because different mediums age differently, require different storage conditions, and tell a story about how the photograph was made.

The medium is separate from the format (the size and shape) and the subject (what the photo shows). A landscape photograph printed on archival paper is a different medium than the same image displayed on a screen, even though both show the same scene. Labeling correctly helps other people — curators, collectors, future viewers — understand what they have and how to care for it.

Key Takeaways

  • Label the actual material the photograph is printed or displayed on: paper type, digital file format, film stock, or metal base.
  • Include the printing or production process if it differs from standard: hand-printed, digitally printed, Polaroid, cyanotype, or platinum print.
  • Place the label on the back of the photograph or in accompanying documentation, never on the front where it can damage the image.
  • Be specific about paper finish and quality when labeling prints, because archival paper and standard photo paper age very differently.
  • For digital photographs, note both the file format (JPEG, RAW, TIFF) and the output medium if the image has been printed or displayed.

Identifying the Base Material

Start by identifying what the photograph is physically made of. If it is a print, feel the surface and look at the edges. Glossy paper has a shiny finish and is common in standard photo printing. Matte paper has a flat, non-reflective surface. Luster paper falls between the two — slightly shiny but not mirror-like. Each has a different look and ages at a different rate.

If the print feels thick and has a cotton or linen texture, it is likely fine art paper or archival paper, which lasts much longer than standard photo paper. Look for a watermark or brand name along the edge — Epson, Hahnemühle, Canson, and Ilford are common archival brands. If you cannot identify the paper by touch or watermark, write "photographic paper, type unknown" rather than guessing.

For older photographs, the base might be metal (daguerreotype or tintype), glass (glass plate negative), or plastic film (35mm film, slide, or negative). These are their own mediums and should be labeled as such. If you have a photograph mounted on cardboard or board, note both materials: "gelatin silver print mounted on board" or "albumen print on card stock."

Noting the Printing or Production Process

The process used to create the photograph is part of the medium label. If you printed the image yourself using a standard inkjet printer on regular paper, the medium is "inkjet print on photographic paper" or "digital print on matte paper." If a lab printed it using a traditional enlarger and light-sensitive paper, it is a "gelatin silver print" or "silver gelatin print."

Hand-printed or hand-processed photographs should always note that: "hand-printed gelatin silver print," "cyanotype," "platinum print," or "gum bichromate print." These processes are labor-intensive and affect how the photograph should be stored and displayed. when ready film photographs like Polaroids or Instax are their own mediums — label them by the film type, not just "when ready print."

If you used a digital camera and the photograph exists only as a digital file, the medium is the file format: "JPEG," "RAW," or "TIFF." If that digital file was then printed, you have two mediums to note — the original digital file and the print medium. You might write "digital photograph (RAW file), printed on archival inkjet paper" to cover both.

Where and How to Write the Label

Never write on the front of a photograph. Ink, pencil, or marker can damage the emulsion or dyes and is visible in the image. Instead, write on the back using a soft pencil (2B or 4B) or a pen designed for photographs. Archival pencils and pens are available from photography supply stores and do not fade or bleed over time.

Write in the lower right corner of the back, leaving space for other information like the date, photographer's name, or location. Use light pressure with a pencil so you do not indent the photograph. If the back is glossy or slick, you can tape a small label to the back instead — use archival tape, not regular masking tape, which yellows and damages prints over time.

For digital files, include the medium information in the file's metadata or in a separate text document stored with the image. Many photo management programs (Lightroom, Capture One, or even Windows Photo Viewer) allow you to add keywords and descriptions that travel with the file. Write something like "Medium: digital photograph, RAW file" in the keywords or description field.

Being Specific About Paper and Finish

The difference between standard photo paper and archival paper is crucial for long-term storage, so be as specific as you can. If you know the brand and product name, write it: "Epson Enhanced Matte Paper" or "Ilford Galerie Prestige Gold." If you do not know the exact product, describe what you see and feel: "matte finish, heavyweight paper" or "glossy paper, standard photo quality."

Archival or fine art papers often have a visible texture — you can see and feel the weave. If the paper has this texture, note it: "textured archival paper" or "cotton rag paper." If the print is on thin, smooth paper that feels cheap, it is probably standard photo paper or even regular inkjet paper, which will yellow and fade faster. Write "standard photo paper" or "inkjet paper" to be honest about the material's longevity.

For color prints, also note whether the print is on color paper (which fades over time) or if it is a black-and-white print (which lasts longer if printed on archival paper). Write "color print on standard photo paper" or "black-and-white gelatin silver print on archival paper" so future viewers know what to expect in terms of color shift or fading.

Labeling Slides, Negatives, and Film

If you have a slide, negative, or film original, the medium is the film type and format. Write "35mm color slide," "120mm black-and-white negative," or "Polaroid when ready film" on the slide mount or negative sleeve — never on the film itself. Use a soft pencil or a label on the mount or sleeve.

If you know the film stock (Kodak Portra, Fujifilm Velvia, Ilford HP5), include that: "35mm Kodak Portra 400 color negative." If you do not know the stock, write what you can see: "35mm color slide" or "medium format black-and-white negative." Store these originals in archival sleeves and boxes, and note the medium on the outside of the storage container as well.

Common Mistakes to Avoid

Do not confuse the medium with the subject or style. "Landscape photograph" is not a medium — "digital print on matte paper" is. Do not write "photo" or "photograph" as the medium; that is too vague. Be specific about the material and process.

Do not assume all prints are the same. A print from a professional lab on archival paper is very different from a print made at home on regular inkjet paper. Take a moment to examine the paper, feel its weight and texture, and look for any brand names or watermarks. If you truly cannot identify the paper, write "photographic print, paper type unknown" rather than guessing.

Do not write the label in permanent marker or ballpoint pen on the back of a print — these can bleed through or damage the emulsion over time. Use a soft pencil or archival pen. Do not use regular tape or stickers, which yellow and damage the print. Use archival tape if you need to attach a label.

Frequently Asked Questions

What if I do not know what kind of paper my print is on?

Describe what you see and feel: the finish (glossy, matte, or textured), the weight (thin or thick), and any visible brand names or watermarks. Write "glossy photographic paper, brand unknown" or "matte finish, heavyweight paper." This is more useful than leaving it blank or guessing incorrectly.

Should I label both the original file and the print?

Yes, if you have both. The original digital file and the printed version are different mediums. Label the print on the back with pencil, and include the medium information in the digital file's metadata or in a text document stored with the file. This way, anyone who finds either version knows what they have.

Can I write the medium label on a sticker instead of directly on the back?

Yes, if you use archival tape or archival stickers. Regular tape and stickers yellow over time and can damage the print when removed. Archival labels are available from photography suppliers and are designed to last as long as the photograph itself. Stick it to the lower right corner of the back.

What medium label should I use for a photograph I printed at home on my inkjet printer?

Write "inkjet print on [paper type]" — for example, "inkjet print on matte photo paper" or "inkjet print on standard copy paper." If you know the paper brand, include it: "inkjet print on Epson Premium Matte Paper." This tells viewers the print is not archival and may fade or yellow over time.

Do I need to label digital photographs that have never been printed?

Yes. Include the medium information in the file's metadata or in a text document with the file. Write the file format (JPEG, RAW, TIFF) and any other relevant details: "digital photograph, RAW file, Canon EOS 5D Mark IV" or "digital photograph, JPEG, smartphone." This preserves information about how the image was created.