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JPEG (also known as JPG) is an image that is compressed to reduce file size, suitable for sharing and posting on the network. Therefore, when you want to enlarge or reuse the JPEG file, the image will be grainy and broken. You can enhance the quality of JPEG files by fine-tuning the image, color, and contrast with image editing software. If you are familiar with photo editing operations, you can use Topaz DeJPEG software; if you are a beginner then you can use free software like Pixlr. If you are familiar with Photoshop, then access the powerful tools in this software to improve image quality.
Steps
Using Pixlr
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Download or run Pixlr online. Pixlr is a powerful photo editing tool used by many photo professionals and enthusiasts. Pixlr offers free online editing software like basic editing apps on phones and computers. You can upgrade to the enhanced version.
- Pixlr Editor is a web application. You can visit the following website to use the Pixlr editor: https://pixlr.com/editor/
- Pixlr Express is an application that runs on the web, iOS and Android operating systems. You can download the app for free from Google Play or Apple App store, or visit https://pixlr.com/express/. [1] X Research Source
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Open the photo you want to edit. The quality of the product after editing depends on the resolution, pixels or the original image. Pixlr encourages users to edit photos at the highest possible resolution. Especially when you are going to enlarge the image because resizing will reduce the image resolution, the space between pixels increases, distorting the image. [2] X Research source Steps to download images in the program:
- In the Pixlr Editor, click the “Browse” button, select the JPEG file, press “Ok” or search for the image on the web and then press the “Open URL” button. [3] X Research Sources
- In Pixlr Express, click the “photos” button and select a photo from your phone or tablet’s photo library. You can take a new photo to edit by clicking the “camera” button.
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Resize the image. Image size is determined by the number of pixels, the more pixels, the larger the image. E-mailing, uploading, or downloading large JPEGs takes time. Resize photos to reduce the number of pixels to help you share photos faster.
- To resize an image on the Pixlr Editor, choose Adjustment > Resize. Change the number of pixels to the desired size, lock the “Aspect Ratio” feature, and then select “Apply”.
- To resize an image on Pixlr Express, click on “Done” and then select “Resize”. Change the number of pixels to the desired size, lock the “Aspect Ratio” feature, and then select “Apply”. [4] X Research Sources
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Crop photo. The cropping feature makes it easy to remove unwanted parts of an image. Cropping an image also reduces the image size.
- To crop an image on the Pixlr Editor, choose Adjustment > Crop. Change the length and width in the bounds dialog. Click outside the photo. If you are satisfied with the new size, click “Yes” in the dialog box that appears on the screen.
- To crop an image on Pixlr Express, choose Tops (Tools) > Crop. Enter the desired number of pixels or select a preset size in the drop-down menu. [5] X Research Sources
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Reduce image noise. You can only use filters for free on Pixlr Editor, on Pixlr you have to pay. Choose Filter > Denoise. You will see the word “Denoise” blink on the image to indicate that the image has been reduced to noise or distortion. Continue reducing the noise until you are satisfied.
- You cannot control the amount of noise reduction each time. [6] X Research Sources
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Use the brush tool to reduce noise. You can use this tool for free on Pixlr Editor, on paid Pixlr. You can reduce the appearance of pixels by coloring discolored pixels. Select the brush tool to redraw the areas of the image that lack detail.
- Zoom in until you can see every single pixel. Choose View > Zoom In.
- Select the eye dropper icon in the dialog box, located just above the hand icon. Use this tool to select the color near the pixel you want to repaint.
- Select the brush tool, located just above the paint bucket icon. Click on the number next to the word “Brush” to expand the tool’s settings. Reduce the opacity to 40% and the hardness to 10%. Choose the brush shape that suits your needs.
- “Dot” the brush carefully on the pixel to color. Click one by one to color the pixels. Use the eyedropper tool to change the color if needed.
- To reduce the mosquito noise, distortion of the object’s border, you need to color the same color as the surrounding object. Reduce brush size and opacity for easier control over coloring.
- Zoom in and out from time to time to get an overview of the photo.
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Edit detailed image areas with the copy mark tool. You can only use this tool for free on Pixlr Editor, on Pixlr you have to pay. The copy mark tool on Pixlr allows you to capture and copy part of an image. That way, you can copy and paste individual pixels or entire objects. Since this tool can capture and reproduce many colors, it is well suited for eliminating or reducing mosquito noise from detailed image areas.
- Zoom in until you see every single pixel. Choose View > Zoom In.
- On pixlr, you stamp with the brush tool. Select the brush tool and adjust the settings. Select a soft brush on line 2 and reduce the opacity. The soft brush and low opacity make it easier to blend colors together.
- Select the copy mark tool, located just below the paint bucket icon. Drag the mouse to the location you want to capture and copy. To activate the copy mark, Windows users must hold down the Alt key, and Mac users must hold down the ⌘ Command key. You click on the area you want to select while holding down the key. Release the mouse and key at the same time.
- To stamp, drag the mouse to the area to be edited and click on it. Repeat the above operation if necessary.
- During the process, you should zoom in and out of the image regularly to check the overall picture. [7] X Research Sources
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Fine-tune the color and contrast of the photo. Pixlr provides users with many ways to change and enhance the image quality. You can use the “Cpor” (color) tool to adjust hue, saturation, brightness, and vividness. If the image is underexposed or overexposed, you can adjust the contrast and brightness of the image with the “Contrast” tool. [8] X Research Sources
- To access this tool on Pixlr, choose Refine > Cpor or Refine > Contrast.
- To access this tool in the Pixlr Editor, choose Adjustment > Cpor or Adjustment > Contrast.
- To access this tool on Pixlr Express, choose Tops > Adjustment > Cpor or Tops > Adjustment > Contrast.
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Adjust photo tones with many other tools. Pixlr comes with many brush-like tools and filters to help you remove minor flaws or change the entire image. Here are some tools:
- Sharpen: Use this tool to sharpen soft edges.
- Blur: Use this tool to soften rough edges.
- Smudge: Use this tool to blend pixels.
- Sponge: use this tool to “absorb” or “saturate” the color
- Dodge: use this tool to increase the light.
- Burn: use this tool to add shadows and contrast to the image.
- Spot Heal: use this tool to remove blemishes or scratches.
- Bloat: use this tool to create a concave effect.
- Pinch: use this tool to create a convex effect.
- Red-eye reduction: use this tool to remove red-eye [9] X Research Source
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Add effects to photos. With effects on Pixlr, you can transform every pixel in your image. Each effect engine uses algorithms to change the appearance of each pixel. Pixlr offers 9 different effects, each with multiple sub-options. Here is the list:
- Atomic, Creative, Default, Soft, Subtle, Too Old, Unicpor, and Vintage. [10] X Research Source
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Save the image and adjust the size. After editing, choose File > Save As, click the “Save” button, or select “Save Image”. If you use Pixlr or Pixlr Editor, you will see a dialog box appear on the screen. On Pixlr, you can rename the image, choose “Files of Type”—choose JPEG— and decide where to save the image. Once done, click “Save”. On Pixlr Editor, you can rename photos. Before saving, the program will ask you to select “Image Quality”.
- A high-quality image is an image that is less compressed, more pixels, so it consumes a lot of data. The saved file is large in size and the image is sharp.
- A low-quality image is an image that is highly compressed, with few pixels, so it consumes less data. The saved file is small in size and the image is less sharp, easily broken. [11] X Research Source
Using Topaz DeJPEG
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Verify that Topaz DeJPEG is compatible with the photo editing software you are using. [12] X Topaz Research Source DeJPEG is a JPEG quality enhancement plugin for mainstream image editing software. The free trial version of this plugin can be used with Adobe Photoshop (Windows and Mac), Paintshop Pro (Windows), Photo Impact (Windows), and Irfanview (Windows).
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Download and install the plugin. [13] X Research Resources To download the free trial version, visit www.topazlabs.com/download in a web browser. Enter your email address and password, click “Download Now”. Scroll down to “Topaz DeJPEG” and select the operating system (Windows or Mac). The download begins and the trial license key will be sent to your email address.
- Turn off Photoshop. If you use Adobe Photoshop, you need to disable the software before installing DeJPEG. If using other software, it is not necessary to turn it off.
- Run the installer. Double click on the downloaded installation file to start the trial process. Enter the trial license key (emailed) when prompted, then click “Install” to proceed with the installation.
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Install DeJPEG into your photo editing software. Before using the plugin you need to add the DeJPEG filter folder to the software you are using. The full path of the DeJPEG plugin folder is as follows Program Files >> Topaz Labs >> Topaz DeJPEG 4 .
- Photoshop: Photoshop users can move on to the next step as DeJPEG is automatically installed into Photoshop’s plugins folder.
- Paintshop Pro: In the File menu, choose “Preferences,” then “File Locations.” Select “Plugins” on the left side of the screen, then click the “Add” button. Navigate to the DeJPEG plugin folder then click “OK.”
- Photo Impact: Open the program and press the F6 key. Select “Plugins” in the list, click the “…” button at the bottom of the first empty plugin folder in the list. In the directory list, select the DeJPEG plugin, then click “OK”. Restart Photo Impact before starting to use the filter.
- IrfanView: Open the program, expand the “Image” menu. Click on “Effects”, then select “Adobe 8BF Filters”. Select “Add 8BF filters” in the menu, navigate to the DeJPEG plugin folder and click OK.
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Start the filter. Open the JPEG image in editing software, then run the DeJPEG tool:
- Photoshop: In the Filters menu, select “Topaz Labs” and then select “DeJPEG 4”.
- Paintshop Pro: In the Effects menu, select “Plugins”, then select “Topaz DeJPEG”.
- Photo Impact: Open the Effect menu and select “Topaz DeJPEG”.
- IrfanView: Open the Image menu, click on “Effects” and then select “Adobe 8BF Filters”. Select “Topaz DeJPEG” in the filter list.
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Enlarge the area of the image to be edited. Click on the magnifying glass (+) icon to enlarge the area of the image that is displayed incorrectly due to image compression.
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Try out the default presets. DeJPEG’s default presets are on the left side of the screen. Click on each preset to preview the image. Note how each preset improves or affects the image. Choose the preset that best suits the JPEG image to be edited. Although it’s not perfect, there’s still more work to be done.
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Adjust the slider in Luminance mode. Select “Luminance” from the option below “Preview Display mode”. Click on “Main” to see a few detailed editing options that the preset missed.
- Reduce Artifacts: First, move the slider all the way to the left. Now, slowly move the slider to the right and observe the details in the preview pane. When moving the slider to the right, the border will be softer but will see noise and checkerboard. Continue moving until the above factors are balanced.
- Sharpen: This slider helps us re-evaluate the softened edges with the Reduce Artifacts slider. When moving the slider to the right you will increase the sharpness.
- Sharp Radius: This slider is used in conjunction with the Sharpen tool. Try moving the slider left or right until the border looks sharp and the artifact disappears.
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Adjust colors. If the color of the image is affected by the previous tools, switch to “Cpor” mode in the Preview Display mode.
- Smooth Cpor: Move the slider left or right until you are satisfied with the image in the preview pane.
- Clear Edge Radius. If you want to adjust the border color in detail, click on the “Advanced” setting, then drag the “Clr Edge Radius” slider upwards. Use in parallel with the Edge Threshpd slider until you are satisfied with the image.
- Adjust Saturation. If the photo colors are pale, move the “Saturation” slider to the right to increase the color level.
- Add grain. Try using the “Add Grain” slider for a more natural look. Move the slider to the right to increase the number of particles.
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Zoom out the photo to see the change. Before saving the product click on the magnifying glass (-) until you see the entire photo in the preview pane. If you’re not satisfied with the result, continue working with presets, opacity, and colors until you’re satisfied.
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Click “OK” to process the image. You have to wait a while to apply the filter to the image.
Using Adobe Photoshop
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Consider how high-quality photos you need. Editing the details of a low-quality compressed JPEG image takes a lot of time and effort.
- If you don’t have much time or don’t have Photoshop installed, see how to use Topaz DeJPEG.
- If you want to improve the quality of your photos for use on Facebook or Instagram apps, this method won’t be as effective as using filters on apps. Pixlr has many free filters that can disguise imperfect JPEGs. If you want to make photos stand out and don’t care about size, try using Pixlr.
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Zoom in on the photo for a closer look. Open the JPEG image in Photoshop, magnify it using the magnifying glass (+) at the top left toolbar. Continue clicking on that icon until the percentage in the lower left corner of the screen shows “300%”. Notice the blocks and gradations up close.
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Look for the “Reduce Noise” filter. Open the “Filter” menu, select “Noise” then “Reduce Noise”.
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Adjust noise reduction options. [14] X Research Source First, check the “Preview” dialog box so you can preview the actual changes.
- Strength: This is the number that determines the level of noise reduction, the lower the quality, the higher this number should be. Drag the slider to the right to see the effect when increasing the strength setting.
- Preserve Details: The smaller the percentage, the more blurred and soft the image is, and also reduces noise.
- Sharpen Details: You can offset the Preserve Details setting by increasing Sharpen Details as it will make the edges of the image sharper. Don’t forget to check the “Remove JPEG artifact” dialog box.
- When satisfied with the preview image, click “OK” to save the new image.
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Reduce noise and color blocks on a wide image area without much detail. (For example skin, cheeks, hair). The goal of this step is to make the image gradation smoother. Use the copy mark tool to work out details in specific objects (eg eyes, ears).
- Zoom in on the image until the color blocks (tiny squares) are clearly visible in the area of the image you need to edit.
- Use the eye drop tool to select the color near the color block you want to remove.
- Select the brush tool. You need to lightly paint over that block of color. Set hardness 10%, opacity 40% and flow 100%.
- Click one at a time, “dot” the brush on the block of color. Don’t hold the mouse and paint in batches because it doesn’t look natural. You can change the colors freely to match the colors, shadows, and highlights of the original image.
- Reduce the brush opacity to 10% for smoother transitions, such as the brow area on the skin. You should choose a neutral color between your skin tone and eyebrow color to fill in the transition. Because of the low opacity, the change happens step by step and looks very natural, don’t be afraid to color the brow area and vice versa.
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Use the copy mark tool in the detailed area. [15] X Research source (E.g. eye area, teeth, insect wings). Since it is difficult to choose the right color to fill these areas, we can use the stamp to get the exact color. Copy stamp allows you to select an image area and copy it to another area.
- Click on the stamp icon and press the Alt key until the mouse pointer turns into a reticle. Select the area right next to the color block or artifacts when compressing the image, avoid color block selections. You should not copy artifacts.
- Resize the brush to fit the artifact area when compressing the image, you can scale it 1-10 px. Set the “hardness” of the brush between 10 and 30% and the “opacity” to about 30%. Apply “dots” point by point to correct the wrong color blocks. Frequently reselect the area you want to copy (by pressing the alt key) because you have to move the entire image.
- Reduce the opacity in the transition. The wrong color blocks sometimes also affect the shape of the image (note the circular iris area is not smooth with many protrusions). You can use a brush to redraw the edge affected by the wrong color block.
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Repeat the operation until you are satisfied with the image. Zoom out the image to 100% for a general view.
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Save photos as high-quality JPEG or PNG, which supports more colors. You don’t want to waste a lot of effort when compressing the image again.
- In Photoshop, choose File >> Save for Web & Devices .
- In the drop-down menu, select “JPEG” and set the quality value to between 80 and 100. Note that the higher the quality, the larger the file size.
- Alternatively, you can choose “PNG-24” to save the file as PNG. The PNG file is larger than the JPEG, but the image is not compressed too much.
Advice
- The history section of Photoshop only saves a certain number of steps while you have to go through a lot of steps in the photo editing process. When you shrink the image, you will realize that there is an error before Photoshop saves it. To avoid this, take a photo again so you can go back to the previous stage if you don’t like the change. You can find the capture button at the bottom of the history panel. Scroll down to see all photos.
- Don’t be afraid to change your brush settings and copy marks, especially if you’ve got a lot of experience using Photoshop. If you don’t want the color dot to affect the image, change the settings.
- If you are editing an image, pay attention to the difference in colors displayed. A blue flower can have many shades of blue: blue, navy, green, purple, brown, etc depending on the light, shade and reflection. Do your best to blend the colors together with an ultra-opaque brush. You can use copy seals if there are too many different colors in a small space.
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JPEG (also known as JPG) is an image that is compressed to reduce file size, suitable for sharing and posting on the network. Therefore, when you want to enlarge or reuse the JPEG file, the image will be grainy and broken. You can enhance the quality of JPEG files by fine-tuning the image, color, and contrast with image editing software. If you are familiar with photo editing operations, you can use Topaz DeJPEG software; if you are a beginner then you can use free software like Pixlr. If you are familiar with Photoshop, then access the powerful tools in this software to improve image quality.
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