GA — 082 Black and white

KodakTri-X 320

Rich tonality and bright highlights, per Kodak; sheet film

Manufacturer
Eastman Kodak
ISO
320
Type
Black and white
Process
B&W
Formats
4x5, 5x7, 8x10
Status
In production
Datasheet
F-4017

Status checked [2]

After: beach cabin under storm clouds, with the preset inspired by Kodak Tri-X 320 (GA — 082 / P) applied (simulation). Before: the same beach cabin under storm clouds, base development without a preset, in color.
fig. 1 · GA — 082 / P · simulation on a digital RAW, not a film scan Drag, tap or use the arrow keys

Character

Contrast
Kodak's development times target a contrast index of 0.56, the same as Tri-X 400
Grain
Diffuse RMS granularity 16 (datasheet), one point finer than Tri-X 400
Latitude
One stop under at normal development; push to EI 1250 (Kodak)
Best for
Low-flare interiors, flash, portraits against soft backlight (Kodak)

Kodak Tri-X 320 (320TXP, also called Tri-X Professional) is a high-speed panchromatic black-and-white negative film sold in sheets [1] [2]. It is not the same film as Tri-X 400: Kodak documents the two on one datasheet but gives them separate figures [1].

Look and color

Kodak describes the 320 as having “excellent tone gradation and brilliant highlights” and recommends it for low-flare interior lighting, flash, and portraits against low-contrast backlight outdoors [1]. Its product page adds a “classic grain structure” and “wide exposure latitude” [2].

  • Color rendering. Kodak publishes a spectral sensitivity curve on this datasheet for Tri-X 400 only. We do not know how far it applies to the 320, so this page has no spectral chart. Our style borrows the 400’s channel weights as an assumption [6].
  • Filters. For the 320, Kodak gives daylight filter factors of 2 for a No. 8 yellow, 2.5 for a No. 15 deep yellow and 8 for a No. 25 red, and 6 for a No. 47 blue [1].

Tonality

  • Contrast. Kodak’s starting-point development times target a contrast index of 0.56, the same as for the 400 [1]. Development in different developers and times will move it.
  • Curve. On the datasheet’s characteristic curve for the 320, the toe is long and low and the straight section keeps rising to the end of the plotted range, with no visible shoulder. This is our reading of the graph, and we see no clear difference in slope from the 400 [1].
  • Latitude. Kodak says one stop of underexposure at normal development gives a slight loss of shadow detail. Two stops need a push to EI 1250, with more contrast and graininess and a further loss of shadow detail [1].
  • Disputed ground. Forum posts summarized in our notes describe the 320 as steeper in the highlights and more sensitive to flare than the 400. These are opinions, not measurements, and we could not open the threads to check them.

Grain and sharpness

Film Diffuse RMS granularity Developer
Kodak Tri-X 320 16 [1] HC-110 (B)
Kodak Tri-X 400 17 [1] HC-110 (B)
  • Kodak rates both figures “fine”. A one-point gap is small [1].
  • Sheet film is enlarged less than 35 mm, so grain usually shows less in practice. That is our observation, not a Kodak claim.
  • Kodak lists “high sharpness” and “high resolving power” and publishes a modulation transfer curve, not a lines-per-millimeter figure [1].

Datasheet digest

Kodak Alaris datasheet F-4017, edition 2021-10. Read the datasheet (PDF) on kodakprofessional.com Shared with Tri-X 400. The spectral sensitivity curve in it is published for the 400 only. Source: manufacturer. The Grain Archive does not host datasheets.

Key figures for Kodak Tri-X 320
ItemValueSource
ISO speed320[2]
Diffuse RMS granularity16, rated 'fine' by Kodak (HC-110 dilution B, 20 °C; net density 1.0, 48 µm aperture, 12×)[1]
Target contrast index0.56 (starting-point development times)[1]
Base7-mil Kodak Estar Thick Base[1]
Underexposure1 stop at normal development (slight loss of shadow detail)[1]
Push processingDevelopment times published for EI 1250 (2 stops)[1]
D-76 stock, tray, 20 °C6 min, continuous agitation[1]
Filter factors, daylightNo. 8 yellow ×2, No. 15 deep yellow ×2.5, No. 25 red ×8, No. 47 blue ×6, No. 58 green ×8[1]
Resolving powerNot given (Kodak: 'high resolving power'); MTF curve published[1]

Names, status and history

  • Tri-X 320 is a separate film. A 35mmc reviewer who used the 320 in 120 in the 1980s and 1990s calls it “a different film than the 400 version” that caused “endless confusion in marketing” [4].
  • Sheets only today. On September 30, 2026, Kodak’s site listed it in 4x5 (10 and 50 sheets), 5x7 (50 sheets) and 8x10 (10 sheets) [2]. Negative Supply likewise says it is available only in sheet sizes [5]. The datasheet gives the base as 7-mil Kodak Estar Thick Base [1].
  • Tri-X 400 is the roll film. It is sold in 135 and 120, and has its own film page [1] [3].
  • Datasheet. The most recent datasheet we found is F-4017 from October 2021, shared with the 400 and published by Kodak Alaris [1].

Alternatives

  • GA — 003 Kodak Tri-X 400

    The roll-film Tri-X, a different emulsion with RMS 17 against 16 and the same target contrast index

  • GA — 019 Kodak T-Max 400

    Kodak's T-grain 400, with a much finer published grain (RMS 10 in D-76)

  • GA — 001 Ilford HP5 Plus

    Also sold in sheets, for large-format work in the same speed range

Get the look in darktable

The GA — 082 / P preset, inspired by Kodak Tri-X 320, is a darktable 5.6 style of 4 native modules, with no LUT. It sits on top of your own exposure and tone mapping.

Measured on test RAW files, CIELab
ZoneMetricBefore → after
skyL55.3 → 59.2
seaL38.4 → 38.3
skinL78.2 → 78.6

Settings, all measurements and limits of the Kodak Tri-X 320 preset

GA — 082 / P · darktable preset

Tri-X 320
for darktable

Full pack · 87 presets · yours to keep
.dtstyle file, darktable 5.6 or later

$20 Get the full pack

Try the free pack first · What the full pack contains

See real photos

Scans of real Kodak Tri-X 320 film, published by others:

Questions about Kodak Tri-X 320

Is Tri-X 320 the same as Tri-X 400?

No. Kodak's datasheet treats them as two films (320TXP and 400TX) with separate development times and grain figures, RMS 16 against 17. A 35mmc reviewer calls the 320 a different film from the 400 and says the two made for endless marketing confusion.

Is Tri-X 320 still made?

Yes, as sheet film. On September 30, 2026, Kodak's site listed it in 4x5 (10 and 50 sheets), 5x7 (50 sheets) and 8x10 (10 sheets). Negative Supply says it is sold only in sheet sizes today. Roll film is Tri-X 400.

Does Tri-X 320 come in 120 or 35mm?

Not today, according to Kodak's product page and datasheet, which list the 320 in sheets only. A 35mmc reviewer used a 320 emulsion in 120 during the 1980s and 1990s, so roll formats existed in the past. Tri-X 400 is the current 135 and 120 film.

How do you push Tri-X 320?

Kodak publishes development times for EI 1250, a two-stop push, in XTOL and other developers, and warns of more contrast and graininess with a further loss of shadow detail. It also says one stop of underexposure at normal development costs only a slight loss of shadow detail.

Sources

  1. 1DS Kodak Professional Tri-X 320 and 400, technical data F-4017 (October 2021)
  2. 2M Eastman Kodak: Tri-X 320 film, product page Accessed September 30, 2026.
  3. 3C Wikipedia: Kodak Tri-X Accessed September 30, 2026.
  4. 4C 35mmc: Kodak Tri-X review (February 7, 2020) Accessed September 30, 2026.
  5. 5C Negative Supply: Film review, Kodak Tri-X 400 and Tri-X 320 (September 10, 2020) Accessed September 30, 2026.
  6. 6B The Grain Archive: Kodak Tri-X 320 style, validation measurements

DS: datasheet · M: manufacturer · C: review or community · B: Grain Archive measurement