Additional charts, including circles arranged on a square 7-patch pie chart   Special (multi-row) Charts (a part of Color/Tone, available with Imatest™ Master) analyzes — patterns consisting of 7 to 12 squares uniformly distributed around a circle, including portions of monochrome or color “pie” charts similar to the one shown on the left. These charts are useful for microscopy and for systems with significant light falloff (vignetting). — any of the monochrome test charts shown below, which can also be analyzed by Stepchart. They are described in detail in Stepchart: Special and ISO charts.       QA-61 ISO-16067-1 Scanner QA-62 […]

Analyze color and grayscale test charts in a fixed batch-capable module Color/Tone Auto (Multitest) incorporates all calculations in Color/Tone Setup (Multicharts), Colorcheck, and Stepchart. News–  Imatest 2020.1  We have added support for the TE269V2 dynamic range chart. Imatest 5.2: We’ve changed the name Multitest to Color/Tone Auto, but we’ll continue to use Multitest for a while (for example, for Imatest IT). Imatest 5.1: (starting December 2018)  The exposure error calculation has been improved to be more consistent over a range of contrast (gamma) values. Details here. Color/ToneSetup and Color/Tone Auto can now measure temporal noise and SNR. With this enhancement, these two new modules have […]

  Algorithms and reference formulas This page contains algorithms and reference formulas for Colorcheck, Color/Tone Setup and Color/Tone Auto. It’s mostly in green text because it’s all math.   RGB to CIELAB (L*a*b*) – Color difference formulas – CIE 1976 – CIE 1994  – CIEDE2000 – Delta-C  Color ellipses(ΔC ab, ΔC 94, ΔC 2000) – Color difference visualizer – Chroma correction (corr) – Algorithm Grayscale and Exposure error (fix in 5.1+) Background reading:  We frequently get difficult questions about color spaces, color space white points, illuminants for measuring CIELAB reference files, color temperatures for measuring images, how to transform between them, and more. […]

Additional charts, including circles arranged on a square 7-patch pie chart   Special (multi-row) Charts (a part of Color/Tone, available with Imatest™ Master) analyzes — patterns consisting of 7 to 12 squares uniformly distributed around a circle, including portions of monochrome or color “pie” charts similar to the one shown on the left. These charts are useful for microscopy and for systems with significant light falloff (vignetting). — any of the monochrome test charts shown below, which can also be analyzed by Stepchart. They are described in detail in Stepchart: Special and ISO charts.       QA-61 ISO-16067-1 Scanner QA-62 […]

Analyze color and grayscale test charts in a fixed batch-capable module Color/Tone Auto (formerly Multitest) incorporates all calculations in Color/Tone Setup, Colorcheck, and Stepchart.  News–  Imatest 2020.1  We have added support for the TE269V2 dynamic range chart. Imatest 5.2: We’ve changed the name Multitest to Color/Tone Auto, but we’ll continue to use Multitest for a while (for example, for Imatest IT). Imatest 5.1: (starting December 2018)  The exposure error calculation has been improved to be more consistent over a range of contrast (gamma) values. Details here. Color/ToneSetup and Color/Tone Auto can now measure temporal noise and SNR. With this enhancement, these two new modules have […]

Algorithms and reference formulas This page contains algorithms and reference formulas for Colorcheck, Color/Tone Setup and Color/Tone Auto. It’s mostly in green text because it’s all math.   RGB to CIELAB (L*a*b*) – Color temperature – Color difference formulas – CIE 1976 – CIE 1994  – CIEDE2000 –  Delta-C – Color ellipses(ΔC ab, ΔC 94, ΔC 2000) – Color difference visualizer – Chroma correction (corr)  Algorithm – Grayscale and Exposure error (fix in 5.1+) Background reading:  We frequently get difficult questions about color spaces, color space white points, illuminants for measuring CIELAB reference files, color temperatures for measuring images, how to transform between them, […]

Additional charts, including circles arranged on a square 7-patch pie chart   Special (multi-row) Charts (a part of Color/Tone, available with Imatest™ Master) analyzes — patterns consisting of 7 to 12 squares uniformly distributed around a circle, including portions of monochrome or color “pie” charts similar to the one shown on the left. These charts are useful for microscopy and for systems with significant light falloff (vignetting). — any of the monochrome test charts shown below, which can also be analyzed by Stepchart. They are described in detail in Stepchart: Special and ISO charts.       QA-61 ISO-16067-1 Scanner QA-62 […]

Analyze color and grayscale test charts in a fixed batch-capable module Color/Tone Auto (Multitest) incorporates all calculations in Color/Tone Setup (Multicharts), Colorcheck, and Stepchart. News–  Imatest 2020.1  We have added support for the TE269V2 dynamic range chart. Imatest 5.2: We’ve changed the name Multitest to Color/Tone Auto, but we’ll continue to use Multitest for a while (for example, for Imatest IT). Imatest 5.1: (starting December 2018)  The exposure error calculation has been improved to be more consistent over a range of contrast (gamma) values. Details here. Color/ToneSetup and Color/Tone Auto can now measure temporal noise and SNR. With this enhancement, these two new modules have […]

Algorithms and reference formulas This page contains algorithms and reference formulas for Colorcheck, Color/Tone Setup and Color/Tone Auto. It’s mostly in green text because it’s all math.   Color difference formulas – CIE 1976 – CIE 1994  – CIEDE2000 – Delta-C –  Color ellipses(ΔC ab, ΔC 94, ΔC 2000) Color difference visualizer – Chroma correction (corr) – Algorithm Grayscale and Exposure error (fix in 5.1+)   Color difference (error) formulas- You have two rectangular patches with different colors. How different are they?   The Wikipedia Color Difference page has a concise introduction to color difference concepts and equations. This page (written before the Wikipedia […]

Additional charts, including circles arranged on a square 7-patch pie chart   Special (multi-row) Charts (a part of Color/Tone, available with Imatest™ Master) analyzes — patterns consisting of 7 to 12 squares uniformly distributed around a circle, including portions of monochrome or color “pie” charts similar to the one shown on the left. These charts are useful for microscopy and for systems with significant light falloff (vignetting). — any of the monochrome test charts shown below, which can also be analyzed by Stepchart. They are described in detail in Stepchart: Special and ISO charts.       QA-61 ISO-16067-1 Scanner QA-62 […]

Algorithms and reference formulas This page contains algorithms and reference formulas for Colorcheck, Color/Tone Setup and Color/Tone Auto. It’s mostly in green text because it’s all math.   Color difference formulas – CIE 1976 – CIE 1994  – CIEDE2000 – Delta-C –  Color ellipses(ΔC ab, ΔC 94, ΔC 2000) Color difference visualizer – Chroma correction (corr) – Algorithm Grayscale and Exposure error (fix in 5.1+)   Color difference (error) formulas- You have two rectangular patches with different colors. How different are they?   The Wikipedia Color Difference page has a concise introduction to color difference concepts and equations. This page (written before the Wikipedia […]

Analyze color and grayscale test charts in a fixed batch-capable module Color/Tone Auto (Multitest) incorporates all calculations in Color/Tone Setup (Multicharts), Colorcheck, and Stepchart. News–  Imatest 2020.1  We have added support for the TE269V2 dynamic range chart. Imatest 5.2: We’ve changed the name Multitest to Color/Tone Auto, but we’ll continue to use Multitest for a while (for example, for Imatest IT). Imatest 5.1: (starting December 2018)  The exposure error calculation has been improved to be more consistent over a range of contrast (gamma) values. Details here. Color/ToneSetup and Color/Tone Auto can now measure temporal noise and SNR. With this enhancement, these two new modules have […]

Additional charts, including circles arranged on a square 7-patch pie chart   Special (multi-row) Charts (a part of Color/Tone, available with Imatest™ Master) analyzes — patterns consisting of 7 to 12 squares uniformly distributed around a circle, including portions of monochrome or color “pie” charts similar to the one shown on the left. These charts are useful for microscopy and for systems with significant light falloff (vignetting). — any of the monochrome test charts shown below, which can also be analyzed by Stepchart. They are described in detail in Stepchart: Special and ISO charts.       QA-61 ISO-16067-1 Scanner QA-62 […]

Analyze color and grayscale test charts in a fixed batch-capable module Color/Tone Auto (Multitest) incorporates all calculations in Color/Tone Setup (Multicharts), Colorcheck, and Stepchart. News–  Imatest 2020.1  We have added support for the TE269V2 dynamic range chart. Imatest 5.2: We’ve changed the name Multitest to Color/Tone Auto, but we’ll continue to use Multitest for a while (for example, for Imatest IT). Imatest 5.1: (starting December 2018)  The exposure error calculation has been improved to be more consistent over a range of contrast (gamma) values. Details here. Color/ToneSetup and Color/Tone Auto can now measure temporal noise and SNR. With this enhancement, these two new modules have […]

Algorithms and reference formulas This page contains algorithms and reference formulas for Colorcheck, Color/Tone Setup and Color/Tone Auto. It’s mostly in green text because it’s all math.   Color difference formulas – CIE 1976 – CIE 1994  – CIEDE2000 – Delta-C –  Color ellipses(ΔC ab, ΔC 94, ΔC 2000) Color difference visualizer – Chroma correction (corr) – Algorithm Grayscale and Exposure error (fix in 5.1+)   Color difference (error) formulas- You have two rectangular patches with different colors. How different are they?   The Wikipedia Color Difference page has a concise introduction to color difference concepts and equations. This page (written before the Wikipedia […]

Additional charts, including circles arranged on a square 7-patch pie chart   Special (multi-row) Charts (a part of Color/Tone, available with Imatest™ Master) analyzes — patterns consisting of 7 to 12 squares uniformly distributed around a circle, including portions of monochrome or color “pie” charts similar to the one shown on the left. These charts are useful for microscopy and for systems with significant light falloff (vignetting). — any of the monochrome test charts shown below, which can also be analyzed by Stepchart. They are described in detail in Stepchart: Special and ISO charts.       QA-61 ISO-16067-1 Scanner QA-62 […]

Analyze color and grayscale test charts in a fixed batch-capable module Color/Tone Auto (Multitest) incorporates all calculations in Color/Tone Setup (Multicharts), Colorcheck, and Stepchart. News–  Imatest 2020.1  We have added support for the TE269V2 dynamic range chart. Imatest 5.2: We’ve changed the name Multitest to Color/Tone Auto, but we’ll continue to use Multitest for a while (for example, for Imatest IT). Imatest 5.1: (starting December 2018)  The exposure error calculation has been improved to be more consistent over a range of contrast (gamma) values. Details here. Color/ToneSetup and Color/Tone Auto can now measure temporal noise and SNR. With this enhancement, these two new modules have […]