HDR Soft Pro - 5.0 - Windows Manual do Utilizador descarregar pdf (Página 37)

Photomatix Pro 5.0 User Manual 35

Dealing with Noise

When you process your photos using Exposure Fusion, the fused image will tend to show less noise than the

source images� This is because Exposure Fusion works by directly combining your bracketed photos, thus

averaging out noise� However, when you create a 32-bit HDR image, your bracketed photos are assembled

in linear space into an image that spans the full range of luminance values captured by the camera� If the

lightest photo of your exposure sequence is not bright enough to expose the shadows of the scene, then

the noise in the source photographs will be transferred to the HDR image� Noise in the HDR image will then

be made more apparent by tone mapping, especially with Details Enhancer as this tone mapping method

increases local details�

Though Photomatix Pro includes options to reduce noise, it is still always better to avoid noise at capture

time as much as possible� There are two tips to ensure a low noise level:

• Tip 1: Set a low ISO setting (ISO 100 or lower) whenever possible

• Tip 2: Overexpose suciently, ensuring that the lightest image of your exposure sequence has its

shadows in the mid-tones�

5.4 Photomatix Pro and Color Management

Photomatix Pro supports color management even if RAW les are processed� You should use the same

working space in Photomatix Pro as you use in other image editors (e�g� Photoshop)�

Photomatix supports the three most popular working spaces:

• sRGB: Use if the images are created only for the web�

• Adobe RGB: Popular working space for printing if extremely saturated colors are not used�

• ProPhoto RGB: Wide gamut working space� This should never be used for 8-bit images�

For all JPEG and TIFF les, Photomatix Pro preserves the color spaces of the source les�

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HDR Soft Pro - 5.0 - Windows Manual do Utilizador Página 37