Reduce ISO Noise in your digital photo.
1. Open image file with Open button 
or Open command from File menu. You also can drag and drop the file from Windows Explorer to the program window.
2 Click Reduce Noise button 
Note: Sometimes the program may report the insufficient memory. In this case, close program and all other applications and increase page file size in My Computer - Properties - Performance Options - Advanced - Virtual Memory.
3. Save file if you are satisfied with results using Save, Save As commands of File menu or press Save button 
.
Click Original 
if you want to revert to the original state of the photo.
Hint: press and hold Spacebar to view the original for quick visual comparison. You can also change display brightness and contrast using shortucts
Options
Use automatic settings if EXIF ISO information is available.
If checked (default), the program will adjust settings according to the information about ISO level and camera model it reads from EXIF header, and ignore all manual settings. Consequently, if you want to change settings manually, you need to switch this option off. To fine tune the performance select one of the predefined set of parameters from Presets. To adjust parameters manually selectCustom from the list of Presets:
Noise Detection
Sensitivity (0..5) - this parameter defines level of overall sensitivity of the noise detector. With higher sensitivity more image elements will be treated as noisy and a resulting image will be more smooth and soft. Low values 0 - 2 are recommended for photos taken in standard conditions with digital cameras. Higher values should be used for photos from low-grade cameras, cameraphones or high ISO speed ratings. You may need to increase the Sensitivity manually if only noise present in the photo is of the type shown on the examples below, because this noise would not be filtered if Sensitivity is low.
Noise Filtering
Strength (0..100) - this parameter controls what percentage of detected noise will be removed.Strength can be set in the range from 0% (no noise is removed) to 100% (all detected noise is removed). High values over 70% may result to less natural look of the filtered image and are recommended only for very noisy images. Lower values can be used for low-noise images with fine textures such as sand.
original Strength = 50 Strength = 80 Details Preservation (0..20) - this parameter defines the sensitivity of the noise filter to fine image details. With higher details preservation parameter more image elements will be treated as details and thus preserved in the resulting image. Values over 8 are recommended for high quality digital photos.
original Details = 1 Details = 10 Sharpening check box turns on the sharpening filter. It is recommended to disable the sharpening filter during testing and adjustment of the noise filter because if the sharpening is enabled, the program does not pop up the warning message when it fails to detect noise in the photo.
original Sharpening OFF Sharpening ON
View and Browse
You can zoom in 
and zoom out 
. Select Zoom to 1:1 command of View menu to display photo in actual pixels (pixel-to-pixel). Run Fit In Window command to stretch the picture to fit in program window.
Next and Previous buttons allow browsing photos in current folder. 
Useful shortcuts
- Enter. Press Enter to process the photo.
- Spacebar. Press Spacebar to quickly switch between displaying original and processed photo.
- Up, Down. Press Up and Down keyboard arrow buttons to increase or decrease preview brightness*.
- Page Up, Page Down. Press Page Up and Page Down keyboard buttons to increase or decrease preview contrast*.
- Home Resets display brightness and contrast.
- Ctrl+P Opens Options dialog.
- Ctrl+Shift+F1 Starts Assistant.
* Only display brightness and contrast are changed, actual pixel values remain unchanged. Values of current display brightness and contrast are shown in the status bar.
