1. Understand the Limitations:
* No Magic Bullet: There's no way to add detail that wasn't originally there. Enlargement inherently involves creating new pixels based on existing ones.
* Original Quality Matters: The better the quality of your original photo (resolution, sharpness, lack of artifacts), the better the enlarged result will be.
* Purpose Matters: How you intend to use the enlarged photo influences the acceptable level of detail loss. A large banner for a distance view has different requirements than a close-up portrait for print.
2. Key Concepts:
* Resampling: The process of creating new pixels when you change the image size. Photoshop uses different resampling algorithms to guess the color and tone values for those new pixels.
* Pixelation: The effect of seeing individual pixels when an image is enlarged too much.
* Artifacts: Unwanted visual distortions (like halos, banding, or blur) that can appear during resampling.
3. Photoshop Methods & Settings (Recommended):
The most reliable method in Photoshop CC 2018 is using Preserve Details 2.0 in the Image Size dialog box.
* Step 1: Open Your Image
* `File > Open` and select your photo.
* Step 2: Image Size Dialog
* `Image > Image Size...` (Or `Alt+Ctrl+I` or `Opt+Cmd+I`)
* Step 3: Set Your Desired Dimensions
* Width/Height: Enter the *new* width and height you want for your enlarged image. Make sure the "Constrain Proportions" chain link icon is active to keep the aspect ratio locked (so you don't distort the image).
* Resolution: If you are enlarging for print, set the Resolution to 300 dpi. If it's for web, 72 dpi is generally fine. The resolution affects the physical size of the image when printed.
* Step 4: The Key Setting - Resample
* This is the most crucial part. From the "Resample" dropdown menu, choose "Preserve Details 2.0".
* Step 5: Reduce Noise
* The Reduce Noise slider appears when "Preserve Details 2.0" is selected. This is *very* important. Experiment with this slider.
* Low values (around 0-20%): Preserves more fine detail but might make noise and artifacts more visible.
* High values (around 50-80%): Smooths out the image, reducing noise and artifacts, but can also soften the image and lose some fine detail.
* Start with a low value (e.g., 10%) and gradually increase it while previewing the image to find the sweet spot. Zoom into the preview window (around 100-200%) to see the effects clearly.
* Step 6: Preview and Adjust
* The dialog box has a preview area. Zoom in to at least 100% (or even 200%) to see the effect of your settings on the details. This is critical.
* Experiment with the `Reduce Noise` slider until you find the best balance between sharpness and artifact reduction.
* If you're not happy, you can always hit "Cancel" and try again with different settings.
* Step 7: Click "OK"
* Once you're satisfied with the preview, click "OK" to apply the enlargement.
4. Important Considerations and Additional Tips:
* Step-by-Step Enlargement: Avoid enlarging in one huge step. If you need to significantly increase the size (e.g., from 200px to 2000px), enlarge in smaller increments (e.g., 200px to 500px, then 500px to 1000px, then 1000px to 2000px), applying the `Preserve Details 2.0` method each time. This often yields better results than a single large enlargement.
* Sharpening: After enlarging, you'll almost always need to sharpen the image slightly.
* Unsharp Mask (Filter > Sharpen > Unsharp Mask): A classic sharpening tool. Use it *subtly*. Start with a small Radius (e.g., 0.5 - 1.0 pixels) and a moderate Amount (e.g., 50-100%). Increase the Threshold only if you see artifacts appearing.
* Smart Sharpen (Filter > Sharpen > Smart Sharpen): Offers more control. Experiment with the "Remove" setting (Lens Blur is often a good choice).
* Noise Reduction (Before or After): If your original image is noisy, consider running a noise reduction filter *before* you enlarge it. Noise can be amplified during the enlargement process. (Filter > Noise > Reduce Noise)
* High-Quality Originals: Start with the best possible original. Use a higher resolution, shoot in good lighting, and use a sharp lens.
* Alternatives to Photoshop's Built-In Resampling:
* Dedicated Upscaling Software: There are specialized software packages designed specifically for image enlargement, such as:
* Topaz Photo AI / Gigapixel AI: Uses artificial intelligence (AI) to analyze and generate new detail. Often provides superior results, but it's an additional expense.
* ON1 Resize AI: Another AI-powered upscaling option.
Example Workflow Summary
1. Open Image
2. Duplicate Layer: `Layer > Duplicate Layer` (to work non-destructively)
3. Noise Reduction (if needed): `Filter > Noise > Reduce Noise` (apply lightly)
4. Image Size (Enlarge Step 1): `Image > Image Size...` with `Preserve Details 2.0` and a reasonable `Reduce Noise` value. Increase size by 200-300% (example: from 500px to 1500px).
5. Image Size (Enlarge Step 2 - if needed): Repeat Step 4.
6. Sharpen: `Filter > Sharpen > Smart Sharpen` (or `Unsharp Mask`). Be subtle.
7. Save: Save as a TIFF (for print) or JPEG (for web).
Key Takeaways:
* Preserve Details 2.0 is your best starting point in Photoshop CC 2018.
* The `Reduce Noise` slider in the Image Size dialog is critical for finding the right balance.
* Stepwise enlargement often produces better results.
* Sharpen *after* enlarging, but be careful not to over-sharpen.
* Consider dedicated upscaling software for the best possible results, especially for large enlargements.
* Experiment and practice to find the settings that work best for your specific images.
By understanding these principles and techniques, you can significantly improve the quality of your enlarged photos in Photoshop CC 2018. Good luck!