Images, similar to screenshots and diagrams, can complement the text, enabling readers to quickly grasp a concept. In the case of the Expert Insights blog, pictures or artistic designs can also add visual interest and capture the reader’s attention. However, you should avoid using images to replace text because transalation services and tools for the visually impaired don’t interpret or translate images. The <alt> tag helps, but don’t rely on that to convey your message.
When to use images#
Include images in the following situations:
When you need to clarify configurations and settings, such as the architecture for virtual servers
When you need to define a complex workflow within a Rackspace product
Do not include images in the following situations:
When a workflow is simplistic, such as using the Control Panel to create a cloud server
When there is no interaction with a Rackspace product
Use the following standards for images:
Size: Make the images as small as you can without compromising their usefulness to reduce page-load time. Unless image clarity is critical, you can use 65-75 percent quality when saving your image. Following are the recommended maximum widths:
Horizontal: maximum width 1200px
Vertical: maximum width 900px
Scope: Limit the scope of an image to the relevant portion, eliminating distracting or unnecessary content and whitespace.
Format: The preferred formats are PNG or SVG, which are loseless formats. However, JPG, which is lossy and might look blurry, is smaller and might load faster.
File name: Create unique and meaningful file names to easily differentiate between images.
Copyright: Do not use copyrighted images without permission or appropriate credit.
Titles: Titles are not required. If you want to add a title to an image for clarity, follow the guidelines in Titles and headings.
Personal or private details: Make sure to mask, modify, or remove any personal identifiers, passwords, logins, or other information that could compromise security.
<alt> property: Use the <alt> property to briefly describe the screenshot for visually-impaired readers. The following list provides some guidance:
For decorative images: leave alt-text blank.
For images with text: use the text in the image.
For charts and graphs: summarize the trend or take-away point.
For other images: What does the image represent or add to the document?
Use the following standards when creating diagrams:
Each diagram property is located on the right side of the Draw.io main screen under Diagrams.
Paper size: Set the paper size to A4 (210 mm x 297 mm) and Landscape.
Background color: Set the background color to none.
File format: Save all diagrams as editable SVG files, as follows:
Click File > Save As.
Type a descriptive name for the file, and replace
.svgat the end of the file name. The file is saved to your local directory.
File name: Create unique and meaningful file names to differentiate diagrams.
Font: Set the font to Helvetica.
Titles: Title must be bolded, aligned left, and be at least 24px in size. Use sentence-style capitalization.
Product icons: An icon represents its corresponding product. Product icons are always blue. Following is the Cloud Images icon.
If you find a Rackspace product icon that is not blue, send an email to email@example.com and a member of our team will create a blue version of the icon.
Stencils: A stencil represents a concept or function. Stencils that are not Rackspace products should always appear in black.
Labels: Label all product icons, stencils, and shapes, according to their function within the diagram. Use sentence-style capitalization (that is, capitalize only terms that are proper or are normally capitalized).
Lines and arrows#
Line usage: Use lines are used to connect and display a relationship between two or more objects.
Line width: Line width must be at least 2pt. You can change the width of a line in the Format Panel under Style when you select the line.
Line shape: Keep lines straight unless a line needs to change direction.
Rounded line corners: If a line changes direction, the corner in which the change of direction occurs must be rounded. You can change to rounded corners by selecting the line, going to the Format Panel under Style, and selecting Rounded in the dropdown menu.
Solid lines: Use solid lines to show a direct relationship between objects, as shown in the following example.
Dashed lines: Use dashed lines to group objects that are connected through a network, as shown in the following example.
Dotted lines: Use dotted lines to show how data entered by the user travels, as shown in the following example.
One-way and two-way arrows: Use arrows to represent direct interactions between two or more stencils. If a stencil is attached to an arrow, it implies that the product represented by the stencil needs to interact with another piece of the diagram.
In the following example, the CDN management service needs to interact with the CDN to perform its function. Similarly, the CDN needs to be managed by the CDN management service. The relationship is two-way, so the line has arrows on both ends pointed to both stencils.