Halftone generator – AttacoSport

On a black T-shirt you print with light ink, so the dots stand for the light areas — black parts of the image get no ink and the shirt shows through. You get a PNG with a transparent background at 300 DPI, with the size in centimetres stored in the file. Your image isn’t uploaded anywhere — everything runs in your browser.

1. Image

Choose an image

PNG or JPG. A photo or graphic with clear light and shadow works best.

Remove a solid background (e.g. white or black) — no dots there

2. Print size

Width cm Height cm

Proportions follow the image — change one and the other updates. Resolution: 300 DPI.

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Presets

DTF fine screen: colours as in the image, dots only where it fades to black, lighter areas in solid colour.

3. Screen

Line screen 45 LPI

Rows of dots per inch. Screen printing on T-shirts is usually 35–65; lower = bigger, bolder dots.

Screen angle 22.5°

For one colour, typically 22.5° or 45°.

Dot shape

Round Elliptical Square Lines

Smallest dot 8%

Smaller dots are dropped — they wouldn’t hold on the screen anyway.

Largest dot 92%

Larger dots become solid ink.

4. Tones

Brightness 0

Contrast 20

Gamma 1

White point 100%

Like Levels in Photoshop: everything lighter than this goes solid ink, dots stay only in the darker tones.

Invert (dark ink on a light shirt — dots in the dark areas)

5. Colours

One ink colour
screen print, vinyl — dots from brightness Colours from the image
DTF — knocks out the shirt colour

Ink Shirt

In one-colour mode the shirt colour is only for the preview.

Remove semi-transparent pixels (sharp edges, 1-bit) — no haze on DTF film, ready for film output

Want us to print it? Download the file and attach it to your enquiry — we’ll reply with a quote. Request a quote

On the shirt — to scale

1:1 zoom (file pixels)

Shirt front ~52 cm (size L). Click the preview to see that spot magnified.