
There are several ways to add a blur to a photo using different versions of Microsoft Paint. If you're using Paint 3D, you can open a new project, insert your chosen image, and use the Select tool to draw a square around the area you wish to blur. You can then shrink the box to your desired size. Alternatively, you can use MS Paint to achieve a pixelated effect by opening your chosen image, selecting the area you want to blur, and dragging the selection inwards. If you're looking for more control over the blur effect, Paint.NET is a free app that offers a range of blur options, including Bokeh Blur, Sketch Blur, and Gaussian Blur. These effects can be customized using various settings, such as Radius, Gamma Boost, and Quality.
| Characteristics | Values |
|---|---|
| Software | Paint 3D, Paint.NET, MS Paint |
| Operating System | Windows |
| Image Format | JPEG, PNG, etc. |
| Method | Use the Select tool to choose the area to blur, then adjust the blur effect using Radius, Gamma Boost, and Quality settings |
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What You'll Learn

Using the 'Select' tool to blur specific areas
If you're looking to blur specific areas of a photo in Paint 3D, the Select tool is a great option. Here's a step-by-step guide on how to use it:
First, open Paint 3D and start a new project by clicking on "New" in the top-left corner. Go to the Menu and click on "Insert" to upload the image you want to blur. You'll find the Insert option in the same top-left corner. Once you've inserted your image, click on the "Brushes" tab, and select the "Select tool" from the top-left corner.
Now, you can begin blurring specific areas. Use the Select tool to draw a square around the area you wish to blur. You can resize this square by clicking on one of the white dots on the corners and dragging it inward to shrink the box. Make sure to zoom in so you can clearly see the area you're blurring.
Once you've selected the area, click on the Select tool again to create another square. This time, click on the white dot in the corner and drag it outward to resize the square back to its original size, covering any remaining white space.
You can adjust the blur intensity by playing with the size of your initial resized square. Drag it a little further or closer to the area you want to blur to control the intensity.
And that's it! Your image is now ready to be posted or shared. This method is a quick and easy way to blur specific areas of your photos in Paint 3D, ensuring confidentiality or adding creative effects.
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How to blur an image in Paint 3D
Although there is no automatic way to blur images in Paint 3D, you can still blur images by following these steps:
Step 1: Open the Paint 3D app and upload your image
Open the Paint 3D app on your Windows 10 PC and launch a new project. Go to the Menu in the top-left corner, click on Insert, and upload the image you want to blur from your computer.
Step 2: Select the area you want to blur
Click on the Select tool present under the Brushes tab. Then, select the portion of the image you want to blur by drawing a square or rectangle around it.
Step 3: Decrease the size of the selected area
Click on one of the white dots on the corner of the selection box and drag it inwards to decrease its size as much as possible. Make sure to keep it just large enough so that you can resize it again.
Step 4: Increase the size of the selected area
Click anywhere on the image, and the remaining area will turn white. Now, increase the size of the selected area using the bottom-right corner until it fits the white area.
Step 5: Delete the selected area
You will notice new icons around your selected image. Hit the Delete key on your keyboard. This will remove the selected area and fill it with a blurred background that matches the rest of your image.
Alternatively, you can use the Magic Select tool under the Brushes option to automatically select the area you want to blur. After selecting the area, simply hit the Delete key to remove it and fill it with a blurred background.
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Using the Sketch Blur effect in Paint.NET
The Sketch Blur effect in Paint.NET is a unique blur effect that produces an artistic, coarse-grained brush stroke painting effect. It is adapted from Andrey Akinshin's P² Quantile Estimator algorithm, which calculates an approximation of the median for a stream of values.
The Radius setting in the Sketch Blur effect determines the size of the brush stroke. Lower Radius settings create the effect of a smaller brush, resulting in more detail. Higher Radius settings mimic a larger brush, rendering less detail.
The Percentile setting is similar to the Gamma Boost in the Gaussian Blur and Bokeh Blur effects. It specifies the brightness bias for colours pulled from neighbouring pixels. The default value of 50 chooses colours at the most common brightness within the pixel's neighbourhood, as defined by the Radius.
The Bokeh Blur effect, which has replaced the Unfocus effect in Paint.NET 5.0 and later, allows for finer control of the Radius, Gamma, and Quality of the blur. The Gamma Boost setting controls the brightness of the image, with higher values resulting in lighter tones and reduced contrast, and lower values enhancing darker tones and increasing contrast. The Quality setting fine-tunes the blurring by controlling its precision; higher values produce a better approximation of the Bokeh effect but take longer to render, while lower values render faster but with a lower quality.
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Applying the Bokeh effect in Paint.NET
Bokeh is a blur effect in Paint.NET that allows you to replicate the transformation of an unfocused image while giving you finer control of the effect. The Radius, Gamma, and Quality controls can be adjusted to fine-tune the blurring by controlling its precision.
The Radius defines the effect strength or amount of blurring. Lower radius settings will create an effect similar to a smaller brush, while higher radius settings will mimic a larger brush with less detail.
The Gamma Boost adjusts the brightness of the blur effect. Raising the gamma value will make the lighter tones dominate, resulting in a "high key" effect and a reduction in overall contrast. Lowering the gamma value will create a "low key" effect, making the darker tones darker and increasing the apparent contrast.
Quality controls the precision of the blurring. Higher quality values will produce a better approximation of a true Bokeh effect but will take longer to render. Lower quality values will render faster but may not look as good.
To apply the Bokeh effect to a specific area of your image, make a selection before running the effect. Only the selected region will be affected, leaving the areas outside the selection unchanged.
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How to use the Gaussian Blur formula in Paint.NET
Paint.NET offers a variety of blur effects to choose from, including the well-known Gaussian Blur formula. This formula results in a defocusing blur, with the Radius specifying the strength of the effect.
To use the Gaussian Blur formula, first select the area of the image you wish to blur. Then, specify the Radius, which determines how much of the image will be sampled. A lower Radius will create a finer-detailed effect, useful for removing noise, while a higher Radius will result in a stronger blur with less detail.
You can further adjust the blur effect by using the Gamma Boost. Increasing the gamma value will enhance lighter tones and reduce overall contrast, creating a "high key" effect. Conversely, lowering the gamma value will intensify darker tones and increase contrast, resulting in a "low key" effect.
Additionally, the Quality setting allows you to fine-tune the blurring. A higher quality setting will produce a better blurring approximation but will take longer to render. If you prioritize speed over precision, you can opt for a lower quality setting, which will render faster at the expense of visual quality.
By adjusting the Radius, Gamma Boost, and Quality settings, you can customize the Gaussian Blur effect to achieve the desired outcome in Paint.NET.
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Frequently asked questions
To add blur to a photo in Paint, open the image in the Paint application. Then, select the area you want to blur using the 'Select' tool. Click on the bottom right corner of the selection and drag the selection inwards to reduce its size.
Paint.NET offers several effects to blur sections of an image, including Bokeh Blur, Sketch Blur, and Gaussian Blur. To apply the blur effect, select the desired area using the selection tool and then choose the effect you want to use from the "Effects" menu.
To add blur to a specific area of a photo in Paint, use the "Select" tool to choose the portion of the image you want to blur. Then, click on one of the white dots on the corners of the selection and shrink the box by dragging it inwards.











































