Reducing the image size may be the image processing we often need. Sometimes we need to reduce the file size or change the pixel size to a custom size, such as 800 x 600 pixels. Or how to change the file size losslessly without reducing the pixel size? How to resize a picture in the Mac Photos application? How much do you know about resizing pictures? In this article we will talk about how to resize pictures on Mac.
1. Resize picture by changing image dimensions
Adjusting the picture size by changing the picture size is our most common way. Open picture with Preview application -> go to Tool -> adjust size, if you need to scale down proportionally, enter the width or height of the photo, and it will automatically adjust. Or you can unselect ”Scale proportionally”, then you can change the width and height to a custom size. And then click File menu -> Export… to save the resized picture.
Next we will introduce how to change the file size without changing the pixel size.
2. Resize file size by changing different image format
Because different image file formats use different compression methods, their file sizes will not be the same. We can use this feature to reduce the file size. For example, when a 1MB screenshot PNG format image is converted to JPG, only 360KB is left. Open a PNG photo with Preview application, go to File menu -> Export… -> and then choose JPEG in the Format option, and click Save button, it will convert the current PNG photo to jpg photo.
3. How to resize photograph in Mac Photos application?
We cannot change the file size or resolution within Photos, but we can export the image from Photos at a smaller pixel size or file size. Select the photo in Photos, go to File menu > Export > Export 1 photo, In the export panel click the "v" to the right pf "Photo Kind: JPEG" to reveal the advanced controls and select the image size (Full Size, Large, Medium, Small, Custom) and quality. Save the file to the local folder.
4. How to reduce picture file size losslessly?
If we keep the picture file format, is there a way to reduce the file size of a picture losslessly? Here we recommend a free software - PhotoPress , which supports batch compression of pictures without loss of image quality. It retains the file format and pixel size, but the compressed image file size is only 20% or less of the previous image.
In addition, it supports custom image pixel size to reduce file size.
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