A guide to 35mm photographic transparencies, slide handling, scanning, colour management and archival digital outputs.
What is a 35mm slide?
A 35mm slide is a positive photographic transparency made on 35mm film and normally mounted in a small frame. Unlike a negative, the image is viewed as a positive rather than inverted.
Why were 35mm slides popular?
Slides were widely used for family photography, travel, education, professional presentations, archives and commercial photography. They could be projected at large scale while retaining considerable photographic detail.
What happens to slides as they age?
Colour dyes can fade or shift, dust and scratches can accumulate, mounts can become damaged and film bases can deteriorate. Storage conditions strongly influence long-term preservation.
How should slides be handled?
Handle slides by their mounts or edges and avoid touching the image surface. The National Archives recommends appropriate enclosures and cool, dry storage for negatives and transparencies.
How are 35mm slides scanned?
Each slide is inspected, cleaned where appropriate and positioned for scanning. The image is captured at a suitable resolution, then colour, orientation, cropping and quality are checked before delivery.
What digital output should I choose?
For everyday viewing, high-quality JPEG can be convenient. For publication, restoration or long-term preservation, higher-quality TIFF or RAW-derived workflows can retain more information for future use.
Why digitise a slide collection?
Digitisation makes images easier to access while reducing the need to handle the originals. The physical slides should still be retained because they remain the primary photographic objects.
Frequently Asked Questions
What is a 35mm slide?
A 35mm slide is a positive photographic transparency, commonly mounted in a small frame for projection or viewing.
Can old 35mm slides be scanned?
Yes. Professional film scanners can capture mounted slides at high resolution and create JPEG, TIFF or other agreed digital outputs.
Should I choose JPEG or TIFF?
JPEG is useful for everyday viewing and sharing, while TIFF is better suited to higher-quality publication and archival workflows.
Further Reading
These sources provide useful background and preservation guidance for this format.
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