Image Compression Settings to Use When Converting an Image to JPG / JPEG.

Image Compression Settings to Use When Converting an Image to JPG / JPEG.

I am trying to find the correct compression settings to use when converting my digital images into ‘jpg’ or ‘jpeg’ format, which achieves best results in terms of image quality and image size.

There are many software that can convert images eg. Photoshop, ACDC, Image converter etc.

Image Compression Settings
Image Compression Settings

I always used the same 90% compression settings to convert from ‘BMP’ to ‘jpg’ and all other digital image compression without my opinion.

Since my photo collection is growing with my digital camera, I wanted to store my images efficiently without losing too much image quality.

After looking at my monthly bandwidth usage for my website, I found that the images are consuming the highest bandwidth.

That’s why I need to be more efficient on image compression of images used for my website to save bandwidth (how to save bandwidth and storage usage of the website)

Converting image from BMP to JPG

I used a little with the following image (this is just a compressed version of the original image)

Original Image Property

Image Type: Bitmap Image

Image size: 3.94 MB

Image Width: 1454 Pixels

Image height: 9 47 pixels

Horizontal resolution: 9 6 dpi

Vertical resolution: 9 6 dpi

Bit depth: 24

Frame count: 1

I converted the image into JPG format using various compression settings (100% – 5%) and recorded the resulting image size for each setting.

Compression Settings (%) Image Size (KB)

Compression settings (%)

Image Size (KB)

100

909

95

389

90

235

85

171

80

136

75

112

70

99

65

88

60

79

55

73

50

69

45

65

40

60

35

57

30

52

25

48

20

43

15

39

10

33

5

27

After analyzing the image quality and image size, I found that using 80% compression settings provides almost the same quality picture which is enough for my digital photo collection archival purpose.

Even the 50% compression setting produces a useful image that can be used on my website without a significant difference from the past, but I save a lot on the site’s storage and bandwidth.

Earlier, I was using the compression setting of 90%, which resulted in size of 235 kb. Using the 50% compression setting, the resulting image size is 69 KB.

So I save about it:

(235 – 69) = 166 KB per image.

Multiply by 1000 unique visitors and I get:

(166 * 1000) = 166000 KB = 166 MB by saving an image!

You may have to find your sweet spot of compression settings to use based on the image quality of your choice, but the general message is that it pays to use different compression settings based on the situation.

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