How to Increase the Resolution of an Image
Learn when to resample, use AI upscaling, or rescan an original—and how to choose pixel dimensions without confusing them with print PPI.
To increase an image’s pixel resolution, resample it in an image editor or use an AI upscaler. The output will have more pixels, but neither method can recover detail the source never captured. If you have the physical photo or original, scanning or photographing it again at higher resolution usually gives you a better source.
First decide what “resolution” means for your output. For a screen, choose the required pixel width and height. For a print, compare those pixels with the intended physical size and print requirements. Changing print dimensions or PPI without resampling changes how the existing pixels map to paper; it does not add image data. [Adobe: Image size, resolution, and resampling]
1. Understand pixels, PPI, and resampling
Pixel dimensions are the image’s width and height in pixels. A 3,000 × 2,000 image contains 6 million pixels, as in Adobe’s explanatory example. PPI (pixels per inch) describes pixel density when an image is printed. Pixel dimensions, print size, and resolution are linked; you cannot set all three independently.
For example, Adobe explains that a 400 × 400 pixel image at 100 PPI prints at 4 × 4 inches. Without resampling, printing those same pixels at 2 × 2 inches makes the density 200 PPI. The file still contains 400 × 400 pixels. [Adobe’s explanation and examples]
Resampling changes the pixel count. Upsampling estimates pixels between or around existing pixels. It can make an image fit a larger output, but may soften edges or create jagged, blocky, or other artifacts. A larger pixel count is not proof that new captured detail has been recovered.
2. Choose the right way to enlarge it
| Method | Use it when | Check |
|---|---|---|
| Conventional resampling | You need a modest increase in pixel dimensions or a specific output size. | Inspect edges and fine details at the intended viewing size. |
| AI upscaling | You need a substantial enlargement and want to compare a generated result with ordinary resampling. | Look closely at faces, text, patterns, and edges. AI can produce plausible-looking detail that was not in the source. |
| Rescan or recapture | A print, negative, or original scene is still available. | Capture the physical source at a suitable resolution before enlarging a small digital copy. |
| Change print size or PPI without resampling | You want to change the physical print dimensions while keeping the existing pixels. | This does not increase pixel dimensions or add image detail. |
No one upscaling method is best for every image. Compare outputs on the actual source and choose based on visible quality, target dimensions, format, and workflow. Adobe documents Photoshop Generative Upscale options, including Topaz Gigapixel; its documented Photoshop feature requires a premium subscription and has a 56-megapixel limit. Topaz’s own documentation states that Gigapixel supports output up to 32,000 pixels on the longest side. Check the current documentation for the specific tool and feature you plan to use. [Adobe Generative Upscale] [Topaz Gigapixel documentation]
3. Increase resolution in Photoshop
- Save a copy of the source so you can compare results and restart without repeated resizing.
- Open the copy and choose Image > Image Size.
- Keep the aspect ratio constrained unless you deliberately want to stretch or distort the image.
- Select Resample if you need to change the pixel width or height. Without resampling, changing print dimensions or resolution changes the print mapping, not the pixel count.
- Enter the target pixel dimensions, or set the intended print dimensions and density for the output. Choose an available resampling method.
- Apply the change, then inspect the result at its intended display or print size. If details look soft, blocky, or distorted, try a smaller enlargement or another method from the untouched source.
Photoshop’s available controls and labels can vary by version. Adobe’s resizing instructions describe the Image Size workflow and available resampling choices. [Adobe: Resize images in Photoshop]
4. Get a better source when you can
If the image came from a printed photograph or another physical original, scan or photograph that original again at higher resolution when possible. This gives the enlargement more source information than starting with a small digital copy. Keep the original scan or capture untouched and make working copies for edits. Adobe also recommends rescanning or retaking a photo when the original is available. [Adobe: How to increase resolution of an image]
If the image is already digital and no better original exists, avoid repeated rounds of enlargement. Return to the original for each experiment so that each resampling step does not compound quality loss.
5. Check the result before using it
- Confirm the output’s pixel width and height match the destination’s requirements.
- For print, confirm the intended physical size and the printer or publication’s requirements; do not treat a generic PPI value as universal.
- View the image at the size people will actually see it, as well as at close range for artifacts.
- Inspect faces, small text, repeating patterns, thin lines, and high-contrast edges separately.
- Keep the original and compare the enlarged version beside it. A smoother-looking result may still contain invented or distorted detail.
- Export to the format and quality settings needed by the destination. Changing the file format does not restore missing source detail.
Adobe’s older resizing guidance gives 72–96 PPI as typical for screens and 150–300 PPI for standard printing, but these are rough ranges, not universal requirements. The right output depends on the destination and viewing conditions. [Adobe resizing guidance]
6. Troubleshooting
| Symptom | Likely cause | What to try |
|---|---|---|
| The pixel dimensions did not change. | Resample was not enabled, or only the print size or PPI was changed. | Enable Resample and enter the required pixel dimensions. If you only need a different print size, unchanged pixels may be correct. |
| The image looks blurry after enlargement. | Upsampling estimated pixels from a source with limited detail, or the increase was too large. | Start again from the original, reduce the enlargement, compare another resampling method, or try an AI upscaler and inspect it carefully. |
| Edges look jagged or blocky. | The source may be too small or compression artifacts may have become more visible. | Use a better source if available; otherwise compare a smaller enlargement and inspect the final output at its actual use size. |
| Faces, text, or textures look wrong after AI upscaling. | The tool generated plausible detail rather than reproducing information in the source. | Compare against the original. Do not rely on generated features as factual detail; try conventional resampling or reacquire the source. |
| The image is stretched. | Width and height were changed independently. | Constrain the aspect ratio, or crop to the desired shape before resizing if the output requires a different ratio. |
| The application rejects the requested output size. | The requested dimensions exceed a tool or feature limit. | Check the current limit for that exact tool and feature, then use smaller dimensions or a different workflow. For example, Adobe documents a 56-megapixel limit for its Photoshop Generative Upscale feature, and Topaz documents a 32,000-pixel longest-side limit for Gigapixel. |
7. Performance, reliability, and cost
Upscaling increases pixel count and can increase processing time and output file size. AI features may have their own subscription, model, or dimension limits; verify those limits before planning a batch workflow. The source material does not establish an independent quality benchmark or a universal winner, so make a small comparison on representative images before processing a large set.
Preserve originals, avoid repeated resampling, and validate outputs at the destination size. If accuracy matters more than a visually plausible result—especially for text, evidence, or fine identifying features—do not treat generated detail as recovered fact.
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FAQ
Can I increase resolution without losing quality?
You can increase pixel dimensions, but enlargement may soften or distort the image. The most reliable improvement is to start from a higher-resolution original when one is available.
Does changing PPI make an image higher resolution?
Changing PPI without resampling changes the relationship between pixels and physical print size. It does not add pixels to the file.
Should I always use AI upscaling?
No. Compare it with conventional resampling on the actual image. AI can produce plausible detail that was not present in the source, and quality depends on the image.
What is the best resolution for a print?
Work from the required physical size, available pixel dimensions, and the printer or publication’s specifications. PPI ranges are guidance, not a universal rule for every print and viewing distance.
