PART I : Reducing File Size
Here we’ll see how to Convert images to JPG and reduce the image quality without reducing the “Visible” Image quality. We will convert images in any file format to JPG (even JPG to JPG) and reduce its file size by reducing the Image Quality level.
- Step 1 : Open IrfanView
- Step 2 : Select File-> Batch Conversion/Rename : A popup window will appear.
- Step 3 : On the Left side of the Popup you can select and add files to be converted.
- Step 4 : Now , on the right.. Under the “Work as” field : Select “Batch Conversion”
- Step 5 : Under “Batch Conversion settings” field : Select “JPG -JPG/JPEG Format” as output file format.
- Step 6 : Now Click Option on the left of File Format selection dropdown and one more popup will appear. Make sure you select the settings as shown in the screenshot below. In my experience the Value for “Save Quality” is optimum between 35 to 50 without inducing and visible quality loss in processed Images. Lower the Value higher will be the compression.Click OK.
- Step 7 : Set your output Path under the field named “Ouput Directory for result files”
- Step 8 : Click “Start Batch” and you are done!
Results :
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| Camera | Image Name | Original File size |
Processed File size |
Compression Ratio* |
| Olympus FE-170 | olympus_1.jpg | 4.23 MB | 450 KB | 89.6% |
| “ | olympus_2.jpg | 4.18 MB | 184 KB | 95.7% |
| “ | olympus_3.jpg | 4.84 MB | 298 KB | 93.9% |
| “ | olympus_4.jpg | 3.90 MB | 412 KB | 89.7% |
| “ | olympus_5.jpg | 4.12MB | 377 KB | 91% |
| Canon EOS 1000D | canon_1.jpg | 3.37 MB | 382 KB | 88.9% |
| “ | canon_2.jpg | 3.31 MB | 325 KB | 90.4% | “ | canon_3.jpg | 3.11 MB | 333 KB | 89.4% |
| Nokia N73 | n73_1.jpg | 743 KB | 214 KB | 71.2% |
| “ | n73_2.jpg | 687 KB | 195 KB | 71.6% |
| “ | n73_3.jpg | 588 KB | 155 KB | 73.6% |
| Fujifilm FinePix HS20EXR | fujifilm_1.jpg | 3.51 MB | 483 KB | 86.5% |
| “ | fujifilm_2.jpg | 2.98 MB | 239 KB | 92.2% |
| “ | fujifilm_3.jpg | 3.55 MB | 663 KB | 81.8% |
NOTE(*) : Here the compression ratio signifies only the decrease in the File size. Higher the compression , lesser will be the File size.
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