This dialog allows you to choose additional options for the selected output image format.
UI Path: ||Render Settings Window|| > Common tab > Image File Output rollout > Image format options button
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PNG Options
Compression level– Allows you to choose compression level for the resulting file. Lower values mean less compression and larger file size. Higher values mean better compression and smaller file sizes. Note that PNG files use a lossless compression, so the resulting image quality is not affected.
Bits per channel– The number of bits for each of the PNG channels (red, green, blue, alpha).
OpenEXR Options
Compression type – Allows you to choose the compression type for the output file:
No compression – Disables all compression. Run-length – Basic form of compression that is comparable to the one used by Targa/BMP files. Scanline Zip – Zip style compression applied to individual scanlines. Block Zip – Zip style compression applied to blocks of 16 scanlines at time. More effective then Scanline Zip, but can be slower to decompress. PIZ – Uses a new combined wavelet / Huffman compression. This form of compression is quite effective when dealing with grainy images, and will often surpass any of the other options under grainy conditions. PXR24 – Converts data to 24 bit then uses Zip compression. It is lossless for half and 32bit integer data and slightly lossy for 32bit float data. B44 – This form of compression is lossy for half data and stores 32bit data uncompressed. B44A – An extension to B44 where areas of flat color are further compressed. Regular B44 compresses uniformly regardless of image content.
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DWAA – JPEG-like lossy compression format. Compresses 32 scanlines together.1, 2 DWAB – Same as DWAA, but compresses blocks of 256 scanlines to achieve better compression ratio.1
Bits per channel – Allows you to choose between 16-bit (half float) and 32-bit (full float) precision.
Data window – Determines what data window information is written to OpenEXR files. This option works only when the Memory frame buffer option of V-Ray is set to Full.
Render region – Sets the data window to the render region. Auto – The data window is determined from the pixels that have non-zero alpha values. Whole image – Sets the data window to the image resolution.
Write Integer IDs – When enabled allows you to write ID information in integer form rather than RGB colors.
Write multi-part EXR – When enabled, multichannel EXRs will be written to a single multi-part file. This feature requires OpenEXR 2 support.
Deep alpha colors – Specifies how the alpha is written in the deep .exr file:
Monochrome – One alpha exr channel is generated, called "A"; RGB – Three color alpha channels are generated: "AR", "AG" and "AB" (red, green, blue alpha); Monochrome+RGB – Generates both the monochrome alpha ("A") channel and the three color alpha channels ("AR", "AG" and "AB").
Extra Attributes – Allows you to specify additional attributes for the OpenEXR file. These are of the format attr1=val1;attr2=val2;... where the values can be either integer or floating-point numbers, or lists of numbers in brackets representing vectors, matrices etc. For example:
If a value cannot be recognized as a number or a sequence of numbers, it is assumed to be a string value.
Write LightSelect RE metadata – When enabled, metadata for the Light Select render elements in the scene is included in multi-channel EXR files. The data is a JSON formatted list with information about which channels are Light Selects, what Light Select Type is used, and what lights are included in it (lights are included by their scene name).
Save Color Corrections To Raw Files (.exr and .vrimg) – Enable this option to save all applied VFB color corrections to the RGB channel of the output image. This does not apply to the sRGB, Gamma 2.2 and ICC display corrections. OCIO, LUT and Background Image corrections are saved if this is explicitly specified in their VFB rollouts.
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JPEG Options
Quality – Allows you to choose the desired JPEG output quality. Lower values represent smaller file size and worse quality; higher values represent larger file size and better image quality.
SGI Options
Bits per channel – Specifies the desired number of bits per channel (8 or 16) in the resulting image.
TIF Options
Image Type – Specifies the desired number of bits per channel (8, 16 or 32) in the resulting image.
Interleaved color channels – When enabled the color information for each pixel will be saved using the Interleaved order which means that the full color for each pixel will be saved before moving to the next one. Some image processing applications require that the image is saved in this mode.
TGA Option
Compression type – Specifies compression options for the resulting image.
VRST options
Compression type – Specifies compression options for the resulting image.
Bits per channel – Specifies the desired number of bits per channel (16 or 32) in the resulting image.
