Resolution, cropping, colour calibration. Best practices before printing a photo !

We’ve all experienced that disappointment before. A photo that looked stunning on screen turns out blurry, poorly framed or with dull colours once printed. It doesn’t have to be that way. In most cases, a few simple checks beforehand would have been enough to avoid the problem.

Printing a high-quality photo isn’t something you can just wing. Resolution, cropping, colour management... these are technical settings that have a direct impact on the final result. They aren’t just for professional photographers. With the right approach, anyone can achieve a result that meets their expectations.

AgfaPhoto Print supports its customers at every stage of the order, with built-in tools to check and adjust files before printing. But even before you reach the platform, here’s everything you need to know to prepare your photos and ensure successful photo prints.

How do you print high-quality photos?

Before we talk about cropping or colour management, there are some basics to get right. The quality of a photo print is largely determined before you even send the file. Resolution, format, file size... these technical parameters directly determine what you’ll end up with.

What is the right resolution for printing photos?

Image resolution is measured in DPI, which stands for ‘dots per inch’, i.e. the number of ink dots per square inch when printed. The higher this figure, the sharper and more detailed the image will be on the final print.

For high-quality photo printing, the recommended minimum is 300 DPI. Below this, details start to get lost and the result can look blurry, especially on large formats. This is the basic rule followed by all reputable photo labs, including AgfaPhoto Print.

In practical terms, a photo taken with a recent smartphone often exceeds 12 megapixels, which is more than enough to print at 300 DPI up to A3 size. For standard photo prints in small or medium formats, images from a recent phone generally produce excellent results without any prior editing.

For printing, is 300 DPI or 600 DPI better?

This is a question many people ask, and the answer is more nuanced than one might think. In theory, 600 DPI offers twice the resolution of 300 DPI. In practice, the difference is often imperceptible to the naked eye on a standard photo.

300 DPI remains the universal benchmark for photo printing. It is the standard used by professional labs for almost all media, from standard prints to photo books and posters. Increasing to 600 DPI only yields a visible improvement on very large-format prints viewed from very close up. Or on certain special media such as fabric prints.

For the majority of orders placed on AgfaPhoto Print, aiming for 300 DPI is more than sufficient. Attempting to reach 600 DPI can even cause practical problems, as file sizes increase considerably, which slows down uploads and can complicate layout in online tools.

How do you choose the right file format before printing?

The image file format is also important. Not all formats are equal in terms of print quality, and some may introduce quality losses that are invisible on screen but visible once printed.

The JPEG format is the most common and is very well suited to photo printing, provided you are working with a high-quality file. When saving as JPEG, the compression level should be set to maximum to limit data loss. A file that is too heavily compressed generates visual artefacts – those unsightly little blocks that appear on areas of uniform colour.

The PNG format is a good option for images with high-contrast areas or embedded text. It does not compress the data and preserves every detail. For a landscape photo book, for example, working with PNG or high-quality JPEG files guarantees crisp pages. It also ensures colours are accurately reproduced on every spread.

Cropping and composition: what to check before sending your photo

It’s important to note that a technically perfect image can still produce a disappointing result if the framing isn’t suited to the chosen print format. This is often where mistakes creep in, and they’re easy to avoid once you know what to look for.

What is image cropping?

Cropping involves selecting a specific portion of an image to remove unnecessary elements or to adapt its proportions to a given format. It is a common step in photography, both to improve the composition and to prepare an image for printing.

Cropping a photo is also a way of refocusing attention on the main subject. A group photo where the faces are too small will benefit greatly from being cropped to bring them closer together. A landscape with too much sky can be rebalanced by reducing this area to give more space to the foreground.

On AgfaPhoto Print, every product features a built-in cropping tool that displays the selected print area in real time. This is a valuable guide, particularly for customisable photo posters, where even the slightest compositional imbalance is immediately apparent on a large format.

What is the best photo cropping ratio for printing?

Each print format has its own proportions. But these do not always match the native aspect ratio of photos taken on a smartphone or camera. It is this discrepancy that leads to unpleasant surprises if not anticipated.

A smartphone generally produces images in a 4:3 or 16:9 ratio. However, a standard 10x15 cm photo print corresponds to a 3:2 ratio and a square format to a 1:1 ratio. If you do not crop the image beforehand, the lab automatically applies a default crop which may cut off important elements – such as a face on the edge or part of the background.

Best practice is to check the target aspect ratio for each product before preparing your files. AgfaPhoto Print clearly states the recommended dimensions for each medium. For a personalised photo T-shirt, for example, the image is centred on a specific area of the garment. Therefore, the cropping must take this space into account so that the subject remains clearly visible and correctly positioned on the fabric.

The most common cropping mistakes and how to avoid them

The first mistake is cropping too tightly. In an attempt to remove background elements, you sometimes end up cutting off important parts of the subject, such as the top of a head, hands or feet. On a large format, this type of unintentional cut is immediately obvious.

The second common mistake is failing to take print margins into account. Most media have a safety zone that must be respected – a border within which no important elements should be placed. If text or a face is too close to the edge, it risks being cropped during the final cut.

To avoid these problems, the simplest solution is to use the preview tools available on AgfaPhoto Print before confirming the order. For media such as photographs on aluminium, where the image is printed edge-to-edge without a white border, you must check the cropping area. This is a truly essential step to achieve a clean and professional finish.

Colour management and final output: how to ensure colours are true to print?

This is often the last step people think of, yet it is the one that causes the most damage when overlooked. A photo with vibrant colours on screen may appear dull or off-colour in print if the colour management has not been set up correctly. Here’s what you need to know to avoid this kind of disappointment.

Which colour space for printing?

Colour space refers to the way colours are encoded and rendered in an image file. There are several colour spaces, and not all produce the same result when printed.

The most common is sRGB. This is the default colour space for almost all smartphones and consumer cameras. It covers a wide colour range and is well suited to standard photo printing. For the majority of orders placed on AgfaPhoto Print, working in sRGB is the recommended approach.

The Adobe RGB colour space, on the other hand, covers an even wider range. It is used by some professional photographers to preserve as many nuances as possible in green and blue tones. But be careful: if your file is in Adobe RGB and the lab works in sRGB, the colours will be automatically converted and may lose some of their vibrancy.

How do you adjust the colour balance?

Adjusting the colour balance of your photos doesn’t require you to be an expert in image editing. A few basic adjustments are sufficient in the vast majority of cases.

The first thing to do is to check your file’s colour space. In Lightroom, Photoshop or even free software like GIMP, this information is accessible in just a few clicks within the export settings. If your file is in Adobe RGB, convert it to sRGB before sending it to print.

Next, remember to calibrate your screen if you edit your photos regularly. A screen that is too bright or has oversaturated colours will give you a false impression of your images. What you see will not match what comes out of the printer. A basic calibration using a tool such as Datacolor Spyder corrects this discrepancy and provides a reliable reference. For demanding media such as photographs on aluminium, where contrasts and metallic reflections amplify every colour deviation, a well-calibrated screen makes a real difference to the final result.

Where can I print high-quality photos? What is the best website for printing photos?

The quality of a print depends as much on the source file as on the lab printing it. Even a perfectly prepared photo can produce a mediocre result, especially if the service provider uses low-end equipment or poor-quality inks.

AgfaPhoto Print draws on the AgfaPhoto brand’s long-standing expertise in the world of photo printing. The equipment used guarantees accurate colour reproduction, deep blacks and crisp whites, across a wide range of media. Every order is handled to the same high standard, whether it’s a simple print or a more complex personalised product.

The platform is designed to be accessible to everyone, with clear preview tools and technical guidance at every stage of the order.

Preparing your photos properly is half the battle

A beautiful photo print starts long before you click ‘order’. Resolution, cropping, colour balance… these are quick steps to check, but they make all the difference between a disappointing photo and a print you’re truly proud of.

The good news is that these habits are quickly picked up. After a few orders, they become second nature. And once you’ve seen the difference in the final result, there’s no going back. Because a photo always deserves to be printed just as it was taken – with care.