Intervention/image · error · AnalyzerException

The specified index is outside of the range

Error message

The specified index is outside of the range

What it means

Thrown by the GD PixelColorAnalyzer when imagecolorsforindex() raises a ValueError, meaning imagecolorat() returned a color index that does not exist in the image's color palette. The pixel coordinates were valid (a separate InvalidArgumentException covers out-of-bounds coordinates at src/Drivers/Gd/Analyzers/PixelColorAnalyzer.php:46), but the palette itself is broken or was modified between the two calls. This only affects palette-based images (GIF, 8-bit PNG); truecolor images have no palette lookup.

Source

Thrown at src/Drivers/Gd/Analyzers/PixelColorAnalyzer.php:54

    /**
     * @throws InvalidArgumentException
     * @throws AnalyzerException
     */
    protected function colorAt(ColorProcessorInterface $processor, FrameInterface $frame): ColorInterface
    {
        $gd = $frame->native();
        $index = @imagecolorat($gd, $this->x, $this->y);

        if (!is_int($index)) {
            throw new InvalidArgumentException(
                'The specified position (' . $this->x . ', ' . $this->y . ') is not within the image area',
            );
        }

        try {
            $colors = imagecolorsforindex($gd, $index);
        } catch (ValueError) {
            throw new AnalyzerException(
                'The specified index is outside of the range',
            );
        }

        return $processor->import($colors);
    }
}

View on GitHub (pinned to 5598b9e397)

Solutions

1. Re-read the image from its original source (fresh ImageManager::read()) so a clean GdImage with an intact palette is built
2. If you manipulate the native resource via $image->core()->native(), stop deallocating colors or replacing the palette while the image object is in use
3. Convert the palette image to truecolor before sampling: imagepalettetotruecolor($image->core()->native())
4. Verify the palette manually: $index = imagecolorat($gd, $x, $y); $index >= 0 && $index < max(imagecolorstotal($gd), 1)
5. If the file itself is damaged, re-encode it with an external tool before processing

Example fix

// before
$color = $image->pickColor(10, 10);

// after
use Intervention\Image\Exceptions\AnalyzerException;

try {
    $color = $image->pickColor(10, 10);
} catch (AnalyzerException $e) {
    // rebuild a clean truecolor core and retry
    $native = $image->core()->native();
    imagepalettetotruecolor($native);
    $color = $image->pickColor(10, 10);
}

$gd = $image->core()->native();
$index = @imagecolorat($gd, $x, $y);
$total = imagecolorstotal($gd);
// truecolor images have no palette limit ($total === 0)
$indexOk = is_int($index) && ($total === 0 || ($index >= 0 && $index < $total));

use Intervention\Image\Exceptions\AnalyzerException;

try {
    $color = $image->pickColor($x, $y);
} catch (AnalyzerException $e) {
    // palette is broken: rebuild a truecolor core and retry once
    imagepalettetotruecolor($image->core()->native());
    $color = $image->pickColor($x, $y);
}

When it happens

Trigger: Calling $image->pickColor($x, $y) or any modifier that samples pixel colors (testModify, testApply, testColorChange paths) on a GIF or palette PNG whose color table is truncated or corrupted; mixing raw GD calls (imagecolordeallocate, imagedestroy on shared palette) with Intervention Image operations on the same native GdImage.

Common situations: GIFs re-saved by tools that emit malformed color tables; user code holding a reference to the native GdImage and freeing/modifying its palette while Intervention Image still operates on it; edge pixels of structurally damaged files downloaded over flaky connections.

Related errors

• Frame #${position} could not be found in the image
• Failed to decode GIF format
• Failed to encode image to GIF format
• Failed to apply Intervention\Image\Drivers\Gd\Modifiers\Shar
• Trim modifier cannot be applied to animated images

AI-assisted analysis of Intervention/image@5598b9e397 (2026-08-23). Data as JSON: /api/errors/386e7b22ba4ee6b6. Report an issue: GitHub.