Often, employees of marketing agencies or beginner graphic designers lack technical knowledge about the operation of individual graphic file formats and their appropriate application. This becomes apparent when they submit vector graphics for online publication in JPG format or when they deliver a PDF file for printing with an RGB color palette and attached custom fonts. The purpose of this article is to provide a quick cheat sheet for such individuals, so that the works they submit do not lose quality as a result of conversion to inappropriate formats and to prevent situations where the prints turn out differently than the document preview on the monitor.

 

 

Collaboration with Photographers

RAW - The Negative of a Photo

The RAW file format, often referred to as the "digital negative," contains a complete set of information captured by the camera's sensor at the moment the photo is taken, without undergoing automatic processing or compression. It's an excellent choice for photographers who plan to precisely process the image using specialized software like Darktable or Adobe Lightroom before using it in graphic works. However, RAW is not the recommended format for transferring to agencies or graphic designers. After fine-tuning the photo's parameters, the photographer should export it to a format that still allows for high-quality digital processing but is not as specialized and closely tied to photography as RAW. TIFF, described below, is the ideal choice for transferring photos.

TIFF - Photos Prepared for Further Processing

Tagged Image File Format (TIFF) is the ideal choice for storing photos in a large, lossless format that can later be digitally enhanced or converted to various other formats. Its advantage lies in the fact that it allows for lossless compression — aiming to reduce the file size (from tens to hundreds of MB) without decreasing quality. This contrasts sharply with the JPG format, where each subsequent save leads to an inevitable loss of sharpness and granularity due to lossy compression. Repeated editing and saving of a JPG file deteriorate the quality with each step, and the loss of details becomes particularly noticeable when enlarging the photo or in its prints.

Graphic designers can directly import TIFF files into projects prepared for printing. However, it may be necessary to convert from an RGB color palette, used by monitors, to a CMYK palette, used by printers. For electronic publication, such as a website or files, conversion to JPG format will be necessary. In this case, lossy compression is only acceptable as the final step, reducing the photo's size from dozens of MB to a few MB.

Collaboration with Graphic Designers

Editable Formats

Each graphic designer, when creating a new project intended for print or an infographic for online publication, will save their work in a format corresponding to the graphic program used. For Adobe InDesign, this will be an INDD file, while for Adobe Illustrator – AI. These files have the following characteristics:

• They are worth keeping as they allow for easy editing and further development of the project.
• They are not suitable for direct online publication, as few have the software to open them.
• They are often not suitable for printers – the printer may not have the required program, and the file may contain links to external files, such as photos or custom fonts, which may not print correctly after the file is transferred.

For these reasons, graphic designers usually convert projects to more universal formats before publication or sending them to printers.

PDF - Ideal for Printers and Online Documents Publishing

Portable Document Format is a versatile format useful for both printing and digital documents publication. It is no suitable to embed images into websites and email - it's usually opened as a separate file. It is also not suitable for extensive editing - beyond minor corrections, graphic designers will encounter significant difficulties in further developing a project based solely on a PDF file. This format is typically used at the final stage of the process, primarily for publishing purposes. Another important aspect to keep in mind is that the method of preparing a PDF file for print differs from that used for preparing it for an online publication.

In the context of materials intended for print, it's crucial that PDF files are based on a CMYK color palette and that all custom fonts have been converted to outlines. Also, photos should be adjusted to the CMYK palette and embedded at high resolution. This ensures that the print will faithfully reflect the design.

For digital publications, an RGB color palette suited for screens and digital devices is recommended. It's also advisable to use a higher degree of image compression so the PDF size doesn't exceed a few megabytes. In comparison, a PDF file for print can be hundreds of megabytes.

JPG - Publishing Photos

The Joint Photographic Experts Group format is an ideal choice for publishing photos online, as it's widely supported by web browsers and file viewing applications. With its lossy compression, JPG can significantly reduce the size of a photo, which is particularly useful with limited internet bandwidth. This compression was specifically designed for photos. However, for publishing various types of infographics, logos, and other graphics where sharp edges and transparency are important, the PNG format might be more suitable.

PNG - Publishing Vector Images

Portable Network Graphics is an excellent choice for publishing infographics, logos, charts, and other graphics based on so-called vector projects. For these types of projects, PNG offers compression that reduces file size while maintaining sharp edges - this is important as JPG compression often disturbs them in such graphics. The differences between raster and vector graphics are demonstrated in the image below:

Above, we used the JPG format for both graphics - that's why you can see some noise around the edges of the charts and shapes on the right. If you split this image in two and used PNG for the right side, then the edges of the graphics would be sharp.

WEBP - The Successor to JPG and PNG

Developed by Google, this format is designed for both static and animated images. It's currently supported by the latest versions of web browsers and is often required by teams designing websites. When creating a file, the graphic designer can choose a compression method similar to that used in JPG or PNG. In most cases, the WebP format allows for smaller file sizes while maintaining comparable quality. Although it is a relatively new format, it's gradually gaining popularity.