Convert ICO to HDR

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Private by design

What happens when you convert ICO to HDR?

Multiple source images

Only one image is decoded; a concatenated image sequence is not exported as a complete set.

An HDR container adds no captured range

This stores display pixels in RGBE; it does not create new HDR detail.

Opaque output

Transparency is replaced with white by default. Change the background in Advanced options.

Lossless sample storage

RLE preserves stored RGBE bytes; RGBE quantization is not exact storage of arbitrary float RGB. The .hdr format is distinct from the general concept of HDR photography. HDR can store its supported image samples without lossy compression. This applies after rendering and sample conversion: it does not guarantee preservation of source precision, colour space or document structure, and cannot undo earlier losses.

ICO

Source

ICO

Windows Icon

Compression: Depends on variantTransparency: YesMetadata: Image dimensions, Colour depth

An icon resource containing several raster sizes and colour depths, with masks or alpha for transparency.

Explore ICO format →

HDR

Target

HDR

Radiance HDR / RGBE

Compression: LosslessTransparency: NoMetadata: Radiance header, EXPOSURE, FORMAT

Radiance pictures with a shared exponent for high-dynamic-range lighting values.

Explore HDR format →

Is ICO → HDR right for you?

Good choice when

HDR fits your delivery use: Lighting environments & radiometry.
You can choose the source image or part needed for delivery.
You need an image in an HDR-capable working pipeline.
An opaque image is acceptable for your destination.

Probably not when

You require a complete collection, page set or multipart round trip.
You expect new highlight or shadow detail from a container change.
You need cutouts or translucent edges for compositing.
You expect lossless encoding to restore lost details or editing structure.

ICO to HDR conversion details

Multiple source images: Only one image is decoded; a concatenated image sequence is not exported as a complete set.
An HDR container adds no captured range: This stores display pixels in RGBE; it does not create new HDR detail.
Opaque output: Transparency is replaced with white by default. Change the background in Advanced options.
Lossless sample storage: RLE preserves stored RGBE bytes; RGBE quantization is not exact storage of arbitrary float RGB. The .hdr format is distinct from the general concept of HDR photography. HDR can store its supported image samples without lossy compression. This applies after rendering and sample conversion: it does not guarantee preservation of source precision, colour space or document structure, and cannot undo earlier losses.
Sample precision & colour: Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.
Metadata & colour: Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.
Compression: ICO: Depends on variant → HDR: Lossless ICO: ICO compression depends on the embedded image payload. Multiple sizes are alternatives, not animation frames; transparency handling differs between old masks and alpha-capable images. HDR: RLE preserves stored RGBE bytes; RGBE quantization is not exact storage of arbitrary float RGB. The .hdr format is distinct from the general concept of HDR photography.
Transparency: Transparency is replaced with white by default. Change the background in Advanced options.
Colour depth: HDR: 32-bit RGBE / XYZE pixel
HDR: HDR: Radiometric values
Multiple images: ICO: Alternative icon sizes
Dimensions: Rendered image dimensions are retained within the converter limits; this tool does not offer resizing. Orientation handling depends on the source decoder.
Metadata: Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.

Common questions

Will every source image be exported?

Only one image is decoded; a concatenated image sequence is not exported as a complete set.

Can HDR recover clipped highlights?

This stores display pixels in RGBE; it does not create new HDR detail.

What happens to transparent areas?

Transparency is replaced with white by default. Change the background in Advanced options.

Are bit depth and colour values guaranteed to match?

Pixel conversion only. Original EXIF, GPS, XMP and ICC profiles are not copied; processing uses 8-bit display pixels.

Will metadata and colour profiles be retained?