Compressing Pictures in PowerPoint

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PowerPoint presentations can easily become quite large due to images and other components. To reduce file size, PowerPoint has compression built-in that you can use on your slides. If using 365, you should be aware of 3D models which may also cause an increase in size, so try to compress images before insertion into the presentation. There is a variety of methods available for compressing images to optimize performance and file size.


What is image compression?

Image compression is a useful method to optimize graphics files for storage or transmission. It reduces the amount of memory and disk space needed, allowing more content to fit into a given space. For networks, it reduces congestion and speeds up content delivery by decreasing file size and thus reducing the bandwidth used for transmissions. By using image compression techniques, users can experience quicker load times without sacrificing image quality.


What are the two types of image compression?

Image file compression relies on two main methods: lossy and lossless. Lossy compaction reduces file size by eliminating redundant data, and can significantly reduce the size of an image. However, this reduction in file size may come at the cost of image integrity if over-compression occurs. With careful application though, lossy compression can maintain a good level of quality while delivering small file sizes. On the other hand, lossless compression minimizes file size without compromising any elements of the original image.

Lossy compression is a double-edged sword. It’s irreversible, which means that compressed images cannot be brought back to their original states. Additionally, repeated applications of the same lossy compression on an image can lead to increased degradation. However, despite this, lossy compression has proven beneficial for web applications since only a moderate amount of imperfection is acceptable when it comes to visuals.

One of the most prevalent examples of lossy compression today is JPEG. This image format can be found in digital photography and all kinds of websites, owing to its popularity and broad support by various tools. Additionally, with JPEG you can compress files according to your preferences; find the right balance between file size and quality.


Lossless image compression is another approach to file size reduction without the cost of removing critical data or reducing quality. As a result, the compressed file can be restored to its original state without any distortions. Although this method offers an impressive level of quality preservation, it does not reduce the file size as much as lossy compression and presents limited advantages when consideration is given to disk space, network bandwidth, or download speeds. Therefore, lossless image compression is often used with product images or artwork where image quality is paramount.


Compress pictures when saving a PowerPoint file

There is a good way to compress all the images when you are saving your PowerPoint file so you can save your PowerPoint and compress images. For doing that you can follow these simple steps:


Step 1:

Click the file tab in the ribbon.


Step 2:

Then click on the save AS.


Step 3:

Direct to the desired location and then name your file.

Note: the name you save your file should be a different name.


Step 4:

Just click on the tools and then a drop-down appears.


Step 5:

Here we want to appear a dialogue box so we should go and click on the compressed pictures.


Step 6:

We had to select the easier resolution.


Step 7:

Simply click OK.


Step 8:

In the last step just click save. 


Use image files at a lower resolution


When inserting pictures into a PowerPoint deck, it is important to consider the size of the images. High-resolution images increase the file size and can slow download time. Choosing a lower-resolution image allows you to optimize your PowerPoint file size while still maintaining a desirable quality level. You may also open an image in an image editings program like Microsoft Picture Manager or Adobe Photoshop and save it at a lower resolution. Doing so will improve performance while preserving necessary quality.


Convert images to a different file type

PowerPoint provides the ability to save, delete, and reinsert images into your presentations. You can edit the images by converting between different file formats, such as TIFF (Tagged Image File Format), JPG (Joint Photographic Experts Group), or PNG (Portable Network Graphics). This feature allows you to reduce the size of an image without loss of quality.

To change an image format and re-insert it into PowerPoint:

Right-click on the image, select Save As Picture from the menu, then choose a file name and save format (e.g. JPG or PNG). To replace the original image in PowerPoint, delete it then click Insert > Picture(s) to add in the new one. Finally, double-click on the saved file to complete the process.

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