Forty photographs that have to look like one shoot

The failure is visible even when each file is fine

A catalogue, a menu, a property listing, a wedding album, a shop’s product grid. Each image can be individually well-edited and the set can still look wrong, because the eye compares neighbours ruthlessly. A grid where one white background is 252 and the next is 247 reads as sloppy instantly, though neither is wrong on its own.

Consistency across a set is a separate skill from editing one image, and it is mostly an organisational skill rather than a technical one.

Anchor the shoot before you edit it

The cheapest consistency comes from capture.

• A grey card or colour checker in the first frame of every lighting setup. One frame. It costs five seconds and it makes white balance a measurement.
• Manual exposure and manual white balance on the camera, not automatic. Automatic modes re-decide per frame, so a dark product and a light product shot under identical light come back at different exposures and different casts, and you spend an hour undoing it.
• Do not move the lights between products. If you must, shoot a new grey card frame.
• Note what changed. A short text file: setup A: frames 1–60, window + white card. setup B: frames 61–120, moved to the table. Future you will need it.

Pick a hero frame and work outward

The method:

1. Choose the frame you most care about, the one going on the homepage, and edit it fully.
2. Copy its develop settings to every other frame from the same setup. In darktable this is copy/paste history stack; in RawTherapee, copy and paste the processing profile; in Lightroom, Sync Settings; in Photoshop’s Camera Raw, select all and synchronise.
3. Then go through the set individually and adjust only what differs: usually exposure by small amounts, because the product’s own lightness changed.
4. Finish by comparing, not by editing.

Step 3 has a discipline attached: adjust exposure, not the tone curve. If you re-shape the curve per frame, the set drifts apart. Keep the curve identical across the set and move the exposure slider, which shifts everything uniformly.

Comparing properly

The eye is good at comparison and bad at memory, so put the images next to each other.

A contact sheet. Build one from the finished exports and look at the whole set at once.

magick montage ./final/*.jpg -tile 8x -geometry 220x220+6+6 -background "#808080" check.jpg

Use a mid-grey background rather than white: white hides the difference between a 250 background and a 255 one, which is precisely the difference you are hunting.

Numbers where the eye is unreliable. Sample the same feature on several frames with a 5×5 average eyedropper and compare. For a catalogue on white, sample the background in three corners of each image; they should be within a couple of units. For a set of portraits, sample the forehead.

Two at a time, side by side, at the same size. Most developers have a compare view. Flipping between two images in the same window is better still, because a change shows as movement.

What cannot be matched

Light that changed during the shoot. An outdoor set shot across four hours has different light in the first and last frames: different colour, different direction, different contrast. You can reduce the difference; you cannot remove it, because the shadows fall in different directions and no colour adjustment moves a shadow.

Different cameras. Two bodies, even from the same manufacturer, render colour differently. Matching them means profiling both with a colour checker and building a correction for one, which is a real job and worth doing for a recurring client.

Mixed capture formats. Half the set raw and half JPEG will never match precisely, because the JPEGs have the camera’s tone curve baked in and the raws do not.

Images from different sources: a client’s old photographs mixed with your new ones. Here you are matching towards something rather than matching a set, and the honest conversation is about how close is achievable. Often the answer is to reshoot the old ones.

A short checklist before a set goes out

• Same pixel dimensions and aspect, or a deliberate and documented set of them.
• Same background value, measured, not eyeballed.
• Same product scale within the frame.
• Shadows present on all or on none.
• Same colour profile embedded on every file.
• Same naming pattern, machine-readable.
• Contact sheet reviewed on grey.
• Three files opened at 100 per cent, chosen to be the hardest cases.

That checklist is ten minutes and it is the difference between a set that looks commissioned and one that looks assembled. It is also the single most common reason a first client comes back with more work, which is worth more than any individual retouching skill in this course.