Comparison Canon PIXMA MG3640S vs Canon PIXMA MG2540S

The color palette that a printer or MFP can print. A large number of colors is required for high-quality photo printing and obtaining color prints with many shades. As a standard, for a color MFP, 4 colors are provided.

The maximum resolution of the image to be printed. It is usually indicated by two numbers indicating the number of dots per inch (dpi) horizontally and vertically, for example 1200x600. The detail of the image depends on this parameter – the higher the resolution, the more fine details the printer is able to convey and the better their image will be. High print resolution is important, foremost, operating with graphic material; low resolution is sufficient for high-quality text display. So there are the following options: 600x600, 1200x600, 1200x1200, 1800x600, 2400x600, 2400x1200, 2400x2400, 4800x600, 4800x1200, 4800x2400, 5760, and higher print resolutions.

The number of pages the printer can produce per minute in black and white mode. Typically indicated for low print quality, higher print quality takes longer. This setting is important if you need to frequently print text documents.

The number of pages the printer can proceed per minute in colour mode. As like b/w printing, the print speed is usually indicated in the worst quality (at maximum speed), in higher quality the print speed is lower. This setting is worth paying attention to if you need to print colour graphic materials frequently.

Printer's print rate in photographic (highest) quality. Unlike other similar parameters, in this case the speed is usually indicated for a 10x15 sheet (A6 as the most popular format for photos). In addition, photo printing speed is not expressed in pages per minute, but in seconds per page, because such printing takes a lot of time. This option is worth paying attention to if you plan to print photos frequently.

Feature of a double-sided printing function. This mode implies that after printing on one side, a special gear turns over a sheet of paper and feeds it for printing on the other side. This not only saves the user from manual paper turn-overs, but also exclude the risk of printing the second side upside down.

Types of cartridges (both black&white and colour) used in the MFP. Some models of the MFP are able to work with third-party cartridges, but this feature usually refers to undocumented, and the manufacturer's warranty applies only to specific types of cartridges. So, use third-party compatible cartridge models with caution.

— Connection to PC (USB). USB is a universal interface used to connect various devices in computer technology, and it is the most popular among these standards nowadays. In this case, it is used to connect the MFP to a computer.

— Network connection ( LAN). Port for wired connection to LAN and/or the Internet. This feature allows you to use the MFP in the format of a network device — getting access to printing, scanning, etc. from any computer of the network, or even use cloud printing (see below). At the same time, some models may require a print server for operating via LAN — a separate PC, router or NAS server responsible for managing the MFP and acting like an intermediary device between the MFP and the rest of the network. However, most modern MFPs can also work in peer-to-peer networks — without a print server, with a direct connection through a simple router.
An alternative to LAN is wireless Wi-Fi (see below); a wired connection is less convenient due to the need to put cables, but it is more reliable and cheaper.

— Wi-Fi. A technology used to make wireless connection to LAN and/or the Internet, and to connect devices directly to each other. For the last option, see Wi-Fi Direct below; and a network connection allows the MFP to operate as a network device — similar to the LAN described above. At the same time,...a wireless connection is somewhat more expensive than a wired one, but it is more convenient because of cable absence.
Modern MFPs may use different Wi-Fi standards — most often it is Wi-Fi 4 (802.11n) and Wi-Fi 5 (802.11ac). In most cases, you should not pay special attention to this nuance: the standards differ primarily in speed, however, these differences are not significant regarding the tasks MFP are operating with; and there are usually no problems with the compatibility of different standards with each other.

— Card Reader. Slot for reading memory cards, usually, with the feature of direct printing (see above). In this case, this function is convenient primarily because memory cards are widely used in modern photo and video cameras; thus, the card reader allows you to quickly and conveniently print the footage — just remove the card from the camera and install it in the MFP. However, this function can be also useful for exchanging data with other devices — for example, laptops; and in some models of the MFP, it is even possible to work in the mode of an external card reader for a PC.

— USB. A classic USB connector for connecting various external media — flash drives, digital cameras, external hard drives, etc. The presence of such a connector usually means at least the possibility of direct printing the content from the connected device, without the need to use a PC. However, there may be other purposes of use, such as copying scanned materials to external media.

— Bluetooth. The technology of wireless communication between various devices is convenient primarily due to the absence of wires. The specific use of Bluetooth in multifunction devices may vary. Some models use such a connection to connect to a PC; this is especially convenient for laptops — almost all modern laptops have built-in Bluetooth modules. Other MFPs allow you to send files from smartphones, tablets and other mobile devices for printing via Bluetooth, or copy scanned materials to external devices. There are models that combine these functions in one way or another. Such details should be clarified separately.

— NFC. Short-range wireless standard with a range limit about 10 cm. Most often used to simplify connection via Wi-Fi or Bluetooth (see above): no need to fiddle with the settings, just bring an NFC-compatible device to the NFC of the MFP and confirm the connection. The other way to use NFC is to automatically send materials for printing when you bring your smartphone or tablet to the device; such feature is usually carried out through a special application released by the MFP's manufacturer.

— Wi-Fi Direct. A feature found on models with built-in Wi-Fi modules (see above). Direct support allows you to connect other Wi-Fi devices (laptops, smartphones, cameras, etc.) to such an MFP directly, without using a router and a local network. This can be especially convenient if there is no network equipment, or if it needs to be additionally configured. The functionality of the Wi-Fi Direct connection is generally similar to Bluetooth (see above); the main difference is that Wi-Fi provides a faster and more reliable connection with a greater range. This is especially useful for transferring large volume of data — for example, sending large documents for printing or copying high-resolution scanned materials. In addition, such a connection is better suited for direct printing from cameras — Wi-Fi is the most common type of wireless connection in that devices.

— AirPrint. Same function as above (Wi-Fi Direct). Allows you to connect to a device without using a router or installing specialized drivers. However, in this case, we are talking about connecting Apple equipment — iPhones, iPad, Mac laptops. AirPrint-enabled printers are natively compatible with devices running iOS or Mac OS software. Printing can be done via a wireless Wi-Fi connection, an Ethernet cable or via a regular USB connection.

The maximum grammage that the MFP can print on. The grammage of the paper depends primarily on its thickness; thick paper is strong, but if it is thicker than allowed by MFP's manufacturer, the paper feeder simply cannot handle such sheets.