Low-ISO-sensitivity JPEG

The Canon EOS Rebel T5i delivers clean JPEGs up through ISO 800.
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Photo by: Lori Grunin/CNET / Caption by:

Mid- to high-ISO-sensitivity JPEG

Above ISO 800, artifacts can be quite noticeable, with the occasional hot pixel, but you can probably get away with ISO 3200 for some scenes.
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Photo by: Lori Grunin/CNET / Caption by:

ISO 100 JPEG

The T5i renders a reasonable level of detail for its class, with no obvious oversharpening or unexpected artifacts.

(1/100 sec, f6.3, AWB, spot metering, ISO 100, 18-55mm STM lens at 55mm)
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Photo by: Lori Grunin/CNET / Caption by:

ISO 400 JPEG

The T5i produces very good JPEGs at ISO 400.

(1/100 sec, f1.8, AWB, spot metering, ISO 400, Sigma 35mm f1.4 lens)
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Photo by: Lori Grunin/CNET / Caption by:

ISO 800 JPEG

ISO 800 is the highest I'd go with JPEG, although here you can see some color noise (the fringing is a lens issue).

(1/40 sec, f2, AWB, spot metering, ISO 400, Sigma 35mm f1.4 lens)
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Photo by: Lori Grunin/CNET / Caption by:

ISO 1600 JPEG

Generally, Canon isn't as aggressive on the color noise as I'd like, but processing raw can make it a little better. The processing seems intelligent when it comes to treating well-illuminated areas differently than underlit ones.

(1/125 sec, f4, AWB, spot metering, ISO 1600, Sigma 35mm f1.4 lens)
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Photo by: Lori Grunin/CNET / Caption by:

ISO 3200 JPEG

While the edges look better than I expected at ISO 3200, you can see the color noise in the dark areas.

(1/60 sec, f3.5, AWB, spot metering, ISO 3200, Sigma 35mm f1.4 lens)
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Photo by: Lori Grunin/CNET / Caption by:

ISO 6400 JPEG

Canon does manange to preserve a reasonable overall tonal quality as high as ISO 6400, and JPEG images look fine scaled down.

(1/80 sec, f2, AWB, spot metering, ISO 6400, Sigma 35mm f1.4 lens)
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Photo by: Lori Grunin/CNET / Caption by:

ISO 6400 raw vs. JPEG

ISO 6400 looks okay if you're willing to exchange color noise for graininess.

(1/80 sec, f2, AWB, spot metering, ISO 6400, Sigma 35mm f1.4 lens)
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Photo by: Lori Grunin/CNET / Caption by:

ISO 12800 JPEG

While it's not great for viewing at actual size, ISO 12800 is fine for use scaled down about half-size.

(1/100 sec, f4, AWB, spot metering, ISO 6400, Sigma 35mm f1.4 lens)
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Photo by: Lori Grunin/CNET / Caption by:

Color

Canon's default colors still deliver occasionally surreal-looking saturation.
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Photo by: Lori Grunin/CNET / Caption by:

Picture Styles

While there are still some hue shifts in the default Auto Picture Style, they're a little less egregious than previously.

(1/40 sec, f4, AWB, spot metering, ISO 100, 18-55mm STM lens at 18mm)
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Photo by: Lori Grunin/CNET / Caption by:

18-55mm STM lens bokeh

The 18-55mm STM lens has pretty nice out-of-focus highlights for a kit lens.

(1/100 sec, f7.1, AWB, spot metering, ISO 100, 18-55mm STM lens at 55mm)
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Photo by: Lori Grunin/CNET / Caption by:
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