> For the complete documentation index, see [llms.txt](https://mapir.gitbook.io/chloros/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mapir.gitbook.io/chloros/image-viewer-gui/opening-an-image-full-screen.md).
# Opening an Image Full Screen
The Chloros Image Viewer provides a dedicated full-screen interface for viewing, analyzing, and manipulating your multispectral images. Whether viewing original images or processed outputs, the Image Viewer offers powerful tools for inspection and analysis.
## Accessing the Image Viewer
### From the File Browser
The most common way to open an image in the Image Viewer:
1. Ensure you're in the **File Browser** tab 
2. Click any **image thumbnail** in the image grid
3. The image opens in the **main preview area** (center of screen)
4. The image is now loaded and ready for full-screen viewing
### Opening the Image Viewer Tab
Once an image is loaded in the preview area:
1. Click the **Image Viewer** 
icon in the left sidebar
2. The Image Viewer tab opens, displaying the selected image full-screen
3. Advanced viewing and analysis tools become available in the left sidebar
***
## Image Viewer Interface Overview
### Main Display Area
The largest portion of the screen shows your image:
* **Full resolution**: Images displayed at native resolution
* **Zoomable**: Use controls or mouse wheel to zoom
* **Pannable**: Click and drag to move around when zoomed
* **Aspect ratio maintained**: Images scale proportionally
***
## Viewing Options
### Basic Image Navigation
#### Browse Through Images
Navigate through your image set using keyboard shortcuts or buttons:
* **Next image**: Click → button or press **→** (Right Arrow) key
* **Previous image**: Click ← button or press **←** (Left Arrow) key
* **Jump to specific image**: Return to File Browser and click desired thumbnail
#### Zoom Controls
Adjust magnification to inspect image details:
**Zoom In:**
* Click **+** (Plus) button
* Press **+** or **=** key
* Scroll mouse wheel **up**
**Zoom Out:**
* Click **−** (Minus) button
* Press **−** (Minus) key
* Scroll mouse wheel **down**
#### Pan When Zoomed
When zoomed in beyond screen size:
1. Move mouse cursor over image
2. Click and **hold left mouse button**
3. **Drag** to move image around
4. Release to stop panning
**Alternative**: Use arrow keys to pan in small increments
***
## Pixel Value Inspection
### Viewing Pixel Values at Cursor
As you move your mouse cursor over the image, pixel values display in real-time:
**Value display location:**
* **Floating number and red line in right side index LUT gradient legend**
* **When zoomed in further, floating value near cursor and highlighted pixel**
* Shows values for pixel **under cursor or highlighted**
* Updates as you move mouse
***
## Image Types You Can View
### JPG
**JPG images from camera:**
* Display JPG data as previewed
* Show original, uncorrected values
* Useful for checking image quality before processing
### RAW (Original)
### RAW (Reflectance)
**After processing:**
* Vignette corrected
* Reflectance calibrated
* Multi-band TIFF (Red, Green, NIR, etc.)
* Scientific data ready for analysis
### RAW (Index)
**NDVI, NDRE, GNDVI, etc. (\_NDVI.tif files):**
* Single-band grayscale images
* Pixel values represent index calculation results
* Range typically -1 to +1 for normalized indices
* Can apply color LUTs for visualization
***
## Index and LUT Application
Apply multispectral indices and color Look-Up Tables:
1. Locate **Index/LUT Sandbox** in **Image Viewer** sidebar
2. Select vegetation index (NDVI, NDRE, etc.)
3. Select multispectral formula, or create your own custom one (Chloros+ only)
4. Apply color LUT gradient for visualization
5. Adjust value ranges and thresholds
See [Index/LUT Sandbox](/chloros/image-viewer-gui/index-lut-sandbox.md) for detailed instructions.
***
## Keyboard Shortcuts
### Navigation
* **→** (Right Arrow): Next image
* **←** (Left Arrow): Previous image
* **Home**: First image in list
* **End**: Last image in list
### Zoom
* **+** or **=**: Zoom in
* **−**: Zoom out
* **Mouse Wheel**: Zoom in/out
***
### Verifying Index Calculations
Check that indices calculated correctly:
1. Open NDVI or other index image
2. Check vegetation areas:
* **NDVI**: Should show 0.4-0.9 for healthy plants
* **NDRE**: Higher values for vigorous growth
* **GNDVI**: Similar to NDVI but chlorophyll-sensitive
3. Check non-vegetation:
* **Soil**: Near 0 or slightly negative
* **Water**: Negative values (-0.5 to 0)
***
## Troubleshooting Viewing Issues
### Image Won't Open
**Possible causes:**
* File corrupted during processing
* Unsupported file format
* Insufficient memory for large image
**Solutions:**
1. Try opening in external viewer to verify file integrity
2. Check file format matches expected type
3. Close other applications to free memory
4. Try smaller/different image
### Black or White Image Display
**Possible causes:**
* Value range outside display capability
* 32-bit float image with unusual values
* Index calculation error
**Solutions:**
1. Check pixel values - if all very low or very high, adjust display range
2. Try opening in QGIS or similar with auto-range adjustment
3. Check Debug Log from processing for errors
### Pixel Values Seem Wrong
**Possible causes:**
* Viewing wrong image (original vs processed)
* Calibration didn't apply correctly
* Light sensor data wasn't included in input
* Percent mode toggled incorrectly
**Solutions:**
1. Verify you're viewing processed output (check filename suffix)
2. Check percent mode button state
3. Compare with known-good images from same dataset
***
## Next Steps
Now that you can view images full-screen:
* [**Image Layers**](/chloros/image-viewer-gui/image-layers.md) - Learn about multi-band visualization
* [**Index/LUT Sandbox**](/chloros/image-viewer-gui/index-lut-sandbox.md) - Apply custom indices and color mapping
* [**Multispectral Index Formulas**](/chloros/project-settings/multispectral-index-formulas.md) - Understand available indices
For processing workflow, see:
* [**Processing Images (GUI)**](/chloros/processing-images-gui/adding-files-to-a-project.md) - Complete processing guide