5 Methods for Reducing Image Size
Content
What is Image compression?
Methods of Images Compression
5 Ways for Images Compression
1, Use Third-Party Tools for Image Compression
2, Compress Images With Preview on Mac
3, Compress Images with Microsoft PowerPoint or Word
4, Reduce Image Size with Windows Paint or Photo app
5, Online tool for Image Compression
What is Image compression?
Image compression is to reduce the data for digital images for convenience on storage, transfer, and dealing with, which is realized by removing the reductant information and unnecessary details about images and keeping best to keep the visual quality of images. With the condition of not affecting image quality, image compression can reduce image size and storage space to improve the speed and efficiency of image transfer.
Methods of Images Compression
There are many methods for image compression. Usually, we would mention lossy and lossless compression for image compression.
Lossless compression usually needs to keep the details of images. That is to compress images without losing the quality. We can use it in medical images.
Lossy image compression would remove the unimportant image data, which would cause lower image quality in details. But it would not affect the visual effect.
And in general, it would use different algorithms for achieving compression.
Color-reducing compression is to compress the image by reducing the color quantity used in the photos. The most algorithm is color quantification and dithering.
Block compression refers to dividing images into several blocks and compressing each block separately.
Preprocessing is to have some preprocessing operations on the image to reduce the image data. The most common ways are smoothing, sharpening, edge detection, and more.
5 Ways for Images Compression
Compressing image is always our demand when we send emails or transfer images online. According to the quantities we want for processing, we can use different methods for image compression.
1, Use Third-Party Tools for Image Compression
Accbestsoft JPEG image compression is a tool for Mac users to compress JPEG images. You can realize the jpeg file compression in two steps. First, adjust the compression level. Then, drag the files to the program for automatic compression. The output files would pop up after compression finished.
There are so many similar tools for image compression. You can check more here — 5 Tools for JPEG Image Compression
2, Compress Images With Preview on Mac
If you do not want the 3rd program, you can use the built-in feature Preview on Mac for image compression.
On Mac, you can use the pre-installed program preview for image compression. It offers several sizes for selection. And you can also customize the image size. Also, you can use it for PDF editing and viewing.
Compress image with Preview:
1, Select the images for compression and click to open them with the Preview on the Menu
2. Click the opened pictures and press Command +A to select all images. Then click “Tool” on the top to select “Adjust size” on the dropdown for compression.
You can select the recommended common-used size provided or custom it by yourself. It would show the size after image compression and the original size. If it meets your demands, press ok to compress images.
For Windows Users, you have more ways to achieve image compression.
3, Compress Images with Microsoft PowerPoint or Word
Microsoft Office supplies a free image compression feature, which PowerPoint and Word can help you to achieve your goal. It allows you to compress all images into a Word file. After compression, you can get a smaller one. If you do not care about the resolution, it is a helpful method for image compression.
Steps for image compression with Word:
1. Run Word or PowerPoint and insert the image and select it.
2. Find the format Tab under Picture Tools on the top and click the compress pictures option on the left group.
There are setting for options and output on the new dialogue Compress Pictures. You can set it according to your demands. Then Click OK for picture compression.
4, Resize Pictures to Reduce Image Size with Windows Paint or Photo app
Besides compressing images, you can also Resize pictures to reduce size with Windows Paint and Photo app.
Open the picture with Paint, and choose the Resize option on the left top. You will get a dialogue for resizing. Input the size you want. Usually, we choose the input pixel. When you input Horizontal, the Vertical will be automatically displayed according to the ratio.
Then, click File and Save As to select a proper format for your image.
Use the Photo app to resize your image with the following instruction
1. Open your pictures with the photo app
2. Click the read more label on the right top and select resize option
3. On the pop-up, there are four options for selection. You can choose any one of them to resize your pictures.
5, Tinypng, an Online tool for Image Compression
If you do not want to download apps or step-by-step settings one by one for image compression, you can use website-based tools for image compression. Most of them support bulk image compression and drag-to-compress processing. You can compress many images in a short time.
With TinyPNG, you can compress 20 pictures at a time. But it has a limitation on picture size, that each must be less than 5MB.
Visit the Tinypng website and drag the image to the site working area in the middle.
Once you add the picture, TinyPNG starts compressing your photos. After finishing the compression, it applies a URL for image downloading and a reduced size for reference. You can download them with the link on the right of the file display area or all images with the button below the files.
It supports PNG, JPEG, and WebP picture compression. You can bulk-compress them in seconds.